Model Number Series Question and Answer for PA / SA Exam 2014

Which number would replace underline mark in the series?  2, 5, 10, 17, ---, 37 A.) 27 B.) 24 C.) 26 D.) 28 Answer: Option 'C' Here the difference between the consecutive terms is increase by 2  5 - 2 = 3,  10 - 5 = 5,  17 - 10 = 7,  then 17 + 9 = 26.

Which number would replace underline mark in the series? 1, 6, 26,_____, 426. A.) 86 B.) 76 C.) 106 D.) 96 Answer: Option 'C' Here the difference between the consecutive terms is multiplied by 4.  The difference of the two consecutive numbers is 5, 20, .....  5 × 4 = 20  20 × 4 = 80  26 + 80 = 106.

Which number would replace underline mark in the series? 1, 20, 58, ____, 191. A.) 105 B.) 115 C.) 111 D.) 116 Answer: Option 'B' Here the difference between the two consecutive terms is 19, 38, 57, 76  58 + 57 = 115

2, 10, 40, 120,____ A.) 240 B.) 360 C.) 470 D.) 210 Answer: Option 'A' Here the series is a multiplication series. The order of the multiplication is ×5, ×4, ×3, ×2  120 × 2 = 240

3, 9, 21, ___, 93 A.) 36 B.) 45 C.) 47 D.) 51 Answer: Option 'B' First difference is 6 and second is 12.  But if we take third as 18, then fourth difference will be 24.  Then 93 can not be the last term.  So we have to take the difference as 6, 12, 24 and 48.  So 21 + 24 = 45.

1, 2, 3, 10, ____, 9802 A.) 199 B.) 999 C.) 99 D.) 298 Answer: Option 'C' 12 + 1 = 2  22 - 1 = 3 32 + 1 = 10 102 - 1 = 99.

2, 10, 26, 50, ___, 122. A.) 82 B.) 90 C.) 80 D.) 62 Answer: Option 'A' Here the series of the form (12 + 1), (32 + 1), (52 + 1), .......

8, 15, 28, 53, __, 199. A.) 100 B.) 101 C.) 102 D.) 103 Answer: Option 'C' ×2 - 1, ×2 - 2, ×2 - 3, ×2 - 4, ×2 - 5.  53 × 2 - 4 = 102

64, 32, 16, 8, 4, __ A.) 4 B.) 6 C.) 2 D.) 1 Answer: Option 'C'

Find the wrong number in the given series? 2 5 13 23 27 41 37 67 A.) 23 B.) 13 C.) 27 D.) 37 Answer: Option 'C' all numbers are prime numbers.. except 27