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General Intelligence Number Series Number Series Q. #6533 (CAT-I)

Find the missing number in the following series: 219, 211, 204, 198, ?, 189

A. 196

B. 193

C. 192

D. 190

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Correct Answer: Option B

The consecutive differences decrease by 1 at each step: 219 - 8 = 211 211 - 7 = 204 204 - 6 = 198 198 - 5 = 193 193 - 4 = 189 • Therefore, the missing term is 193.

General Intelligence Number Series Number Series Q. #6532 (CAT-I)

Find the wrong number in the following series: 6, 11, 16, 20, 26

A. 20

B. 16

C. 26

D. 11

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Correct Answer: Option A

The series has a constant difference of +5 between consecutive terms: 6 + 5 = 11 11 + 5 = 16 16 + 5 = 21 (given as 20) 21 + 5 = 26 • Therefore, 20 is the incorrect number in the series.

General Intelligence Number Series Number Series Q. #6531 (CAT-I)

Find the wrong number in the given sequence: 331, 482, 551, 263, 383, 242, 111

A. 263

B. 482

C. 383

D. 242

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Correct Answer: Option C

In each valid number, the product of the first (hundreds) and third (units) digit equals the middle (tens) digit: 3 × 1 = 3 in 331 4 × 2 = 8 in 482 5 × 1 = 5 in 551 2 × 3 = 6 in 263 2 × 2 = 4 in 242 1 × 1 = 1 in 111 • For 383, 3 × 3 = 9 ≠ 8. Therefore, 383 is the wrong number.

General Intelligence Number Series Number Series Q. #6530 (CAT-I)

Identify the incorrect number in the sequence: 7, 28, 63, 124, 215, 342

A. 28

B. 63

C. 124

D. 342

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Correct Answer: Option A

The pattern follows n³ - 1 for n = 2, 3, 4, 5, 6, 7: 2³ - 1 = 8 - 1 = 7 3³ - 1 = 27 - 1 = 26 (given as 28) 4³ - 1 = 64 - 1 = 63 5³ - 1 = 125 - 1 = 124 6³ - 1 = 216 - 1 = 215 7³ - 1 = 343 - 1 = 342 • Hence, the wrong number in the series is 28.

General Intelligence Number Series Number Series Q. #6529 (CAT-I)

Find the wrong number in the given series: 2, 5, 10, 17, 26, 37, 50, 64

A. 37

B. 64

C. 26

D. 50

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Correct Answer: Option B

The series represents n² + 1 for consecutive integers starting from 1: 1² + 1 = 2 2² + 1 = 5 3² + 1 = 10 4² + 1 = 17 5² + 1 = 26 6² + 1 = 37 7² + 1 = 50 8² + 1 = 65 (instead of 64) • Thus, 64 is the incorrect term.

General Intelligence Number Series Number Series Q. #6528 (CAT-I)

Find the next term in the following series: (2, 3), (3, 5), (5, 7), (7, 11), (11, 13), ?

A. (13, 15)

B. (13, 19)

C. (13, 17)

D. (15, 17)

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Correct Answer: Option C

Each pair consists of two consecutive prime numbers (pₙ, pₙ₊₁): First pair: (2, 3) Second pair: (3, 5) Third pair: (5, 7) Fourth pair: (7, 11) Fifth pair: (11, 13) • Following consecutive primes after 11 are 13 and 17, so the next pair is (13, 17).

General Intelligence Number Series Number Series Q. #6527 (CAT-I)

Find the missing number in the series: 1, 1.5, 2.5, 4, ?, 8.5, 11.5

A. 5.0

B. 6.0

C. 5.5

D. 6.5

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Correct Answer: Option B

The difference between consecutive terms increases by 0.5 each step: 1 + 0.5 = 1.5 1.5 + 1.0 = 2.5 2.5 + 1.5 = 4.0 4.0 + 2.0 = 6.0 6.0 + 2.5 = 8.5 8.5 + 3.0 = 11.5 • Therefore, the missing value is 6.0.

General Intelligence Number Series Number Series Q. #6526 (CAT-I)

Find the missing term in the sequence: 3, 12, 27, 48, 75, 108, ?

A. 147

B. 162

C. 183

D. 192

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Correct Answer: Option A

The pattern of the sequence is 3 × n² where n = 1, 2, 3, 4, 5, 6, 7: 3 × 1² = 3 × 1 = 3 3 × 2² = 3 × 4 = 12 3 × 3² = 3 × 9 = 27 3 × 4² = 3 × 16 = 48 3 × 5² = 3 × 25 = 75 3 × 6² = 3 × 36 = 108 3 × 7² = 3 × 49 = 147 • Hence, the correct term is 147.

General Intelligence Number Series Number Series Q. #6525 (CAT-I)

What is the next term in the given number series: 2, 6, 12, 20, 30, 42, 56, ?

A. 64

B. 70

C. 72

D. 76

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Correct Answer: Option C

The series follows the pattern of consecutive product of integers n × (n + 1) or adding consecutive even numbers: 1 × 2 = 2 2 × 3 = 6 3 × 4 = 12 4 × 5 = 20 5 × 6 = 30 6 × 7 = 42 7 × 8 = 56 8 × 9 = 72 • Thus, the next number in the sequence is 72.

General Intelligence Number Series Number Series Q. #6524 (CAT-I)

Find the missing number in the series: 5, 16, 49, 148, ?

A. 440

B. 441

C. 443

D. 445

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Correct Answer: Option D

The underlying pattern multiplies the previous term by 3 and adds 1: 5 × 3 + 1 = 16 16 × 3 + 1 = 49 49 × 3 + 1 = 148 148 × 3 + 1 = 445 • Therefore, the missing term is 445.

General Intelligence Number Series Number Series Q. #6523 (CAT-I)

Find the wrong number in the sequence: 102, 101, 98, 93, 86, 74, 66, 53

A. 101

B. 93

C. 74

D. 66

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Correct Answer: Option C

• The pattern involves subtracting consecutive odd numbers starting from 1. 102 - 1 = 101 101 - 3 = 98 98 - 5 = 93 93 - 7 = 86 86 - 9 = 77 77 - 11 = 66 66 - 13 = 53 • Hence, the number 74 is incorrect and must be replaced by 77.

General Intelligence Number Series Number Series Q. #6522 (CAT-I)

Identify the incorrect number in the series: 380, 188, 92, 48, 20, 8, 2

A. 92

B. 48

C. 20

D. 188

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Correct Answer: Option B

• The recurring pattern from one term to the next is (÷ 2 - 2). 380 ÷ 2 - 2 = 190 - 2 = 188 188 ÷ 2 - 2 = 94 - 2 = 92 92 ÷ 2 - 2 = 46 - 2 = 44 44 ÷ 2 - 2 = 22 - 2 = 20 20 ÷ 2 - 2 = 10 - 2 = 8 8 ÷ 2 - 2 = 4 - 2 = 2 • Thus, 48 is the wrong term; it should be 44.

General Intelligence Number Series Number Series Q. #6521 (CAT-I)

Find the wrong number in the following series: 8, 14, 26, 48, 98, 194, 386

A. 14

B. 26

C. 48

D. 98

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Correct Answer: Option C

• The difference between consecutive terms doubles at each step. 14 - 8 = 6 26 - 14 = 12 = (6 × 2) Next term should be 26 + 24 = 50 50 + 48 = 98 98 + 96 = 194 194 + 192 = 386 • Therefore, 48 is incorrect and should be replaced by 50.

General Intelligence Number Series Number Series Q. #6520 (CAT-I)

Find the incorrect (wrong) number in the given series: 1, 8, 27, 64, 124, 216, 343

A. 27

B. 64

C. 216

D. 124

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Correct Answer: Option D

• The terms in the series are standard cubes of consecutive natural numbers n³. 1³ = 1 2³ = 8 3³ = 27 4³ = 64 5³ = 125 6³ = 216 7³ = 343 • Hence, the number 124 is incorrect; it should be 125.

General Intelligence Number Series Number Series Q. #6519 (CAT-I)

Find the missing number in the sequence: 128, 127, 123, 114, 98, ?

A. 81

B. 73

C. 78

D. 64

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Correct Answer: Option B

• The series subtracts consecutive perfect squares starting from 1². 128 - 1² = 128 - 1 = 127 127 - 2² = 127 - 4 = 123 123 - 3² = 123 - 9 = 114 114 - 4² = 114 - 16 = 98 Missing term = 98 - 5² = 98 - 25 = 73