General Ability: Number Series — Solved MCQs Solved MCQs

Correct Answer: 31

The differences increase by 2 each time (6, 8, 10, 12, 14), so 21 + 10 = 31.

Correct Answer: 66

The differences increase by 3 each time (3, 6, 9, 12, 15, 18), so 48 + 18 = 66.

Correct Answer: 73

The differences increase by 3 each time (5, 8, 11, 14, 17), so 56 + 17 = 73.

Correct Answer: 172

The differences increase by 11 each time (11, 22, 33, 44, 55), so 117 + 55 = 172.

Correct Answer: 23

The additions alternate +2 and +4 (11 + 2 = 13, + 4 = 17, + 2 = 19, + 4 = 23, + 2 = 25), so the missing number is 23.

Correct Answer: 65

The differences double each time (2, 4, 8, 16, 32), so 33 + 32 = 65.

Correct Answer: 369

The differences triple each time (3, 9, 27, 81, 243), so 126 + 243 = 369.

Correct Answer: 101

Each term is 8 less than the previous one, so 109 - 8 = 101.

Correct Answer: 6

The subtractions shrink by 7 each time (35, 28, 21, 14, 7), so 13 - 7 = 6.

Correct Answer: 33

The subtractions grow by 4 each time (3, 7, 11, 15, 19), so 52 - 19 = 33. The printed option labels misprint (a) as "1)" and (c) as "3)"; the options are read positionally.

Correct Answer: 59

The subtractions double in size each time (3, 6, 12, 24, 48), so 107 - 48 = 59.

Correct Answer: 20

The differences are squares (0, 1, 4, 9, 16, 25), so 11 + 9 = 20. The printed series omits the comma before the blank; it is read as 6, 6, 7, 11, ?, 36, 61.

Correct Answer: 40

The differences are squares (4, 9, 16, 25, 36), so 24 + 16 = 40.

Correct Answer: 215

Each term is one less than a cube: 2^3 - 1 = 7, 3^3 - 1 = 26, 4^3 - 1 = 63, 5^3 - 1 = 124, so the next is 6^3 - 1 = 215.

Correct Answer: 129

The differences are 7, 19, 37, 61, 91, whose own differences increase by 6 (12, 18, 24, 30), so 68 + 61 = 129.

Correct Answer: 350

Each term is a cube plus its root: 2^3 + 2 = 10, 3^3 + 3 = 30, 4^3 + 4 = 68, 5^3 + 5 = 130, 6^3 + 6 = 222, so the next is 7^3 + 7 = 350.

Correct Answer: 179

Each term is doubled and then an odd number is added (x2 + 1, x2 + 3, x2 + 5, x2 + 7, x2 + 9), so 85 x 2 + 9 = 179.

Correct Answer: 120

The terms are factorials: 0! = 1, 1! = 1, 2! = 2, 3! = 6, 4! = 24, so the next is 5! = 120.

Correct Answer: 214

Each difference is twice the previous difference minus 1 (14, 27, 53, 105), so 109 + 105 = 214.

Correct Answer: 50

The differences follow x3 + 2 (3, 11, 35, 107, 323), so 15 + 35 = 50. The printed series omits the comma after the blank; it is read as 1, 4, 15, ?, 157, 480.

Correct Answer: 16/63

The numerators double (1, 2, 4, 8, 16, 32) and the denominators are one less than powers of 2 (3, 7, 15, 31, 63, 127), so the missing fraction is 16/63.

Correct Answer: 12

Two interleaved series: the odd-position terms multiply by 3 (8, 24, 72, 216) and the even-position terms divide by 3 (108, 36, 12), so the missing even-position term is 12.

Correct Answer: 13, 16

Two interleaved series, in blank order: the even-position terms increase by 3 (7, 10, 13, 16) and the odd-position terms increase by 1, then 2, then 3, then 4 (6, 7, 9, 12, 16), so the missing numbers are 13 and 16.

Correct Answer: 35

Two interleaved series, each increasing by 2: the odd-position terms are 29, 31, 33, 35 and the even-position terms are 33, 35, 37, so the next odd-position term is 35.

Correct Answer: 8

Two interleaved series: the odd-position terms increase by 1, then 2, then 3 (2, 3, 5, 8) and the even-position terms double (2, 4, 8, 16), so the missing even-position term is 8.