Series Completion — Part 2 MCQs with Explanations

The pattern is + 90 + 100, + 110,..... So, missing term = 310 + 120 = 430.

The pattern is - 1, x 10 + 1, - 1, x 10 + 1, - 1, x 10 + 1, ..... So, missing term = 10 x 10 + 1 = 101.

The pattern is + 5, + 20, + 80, + 320, ...... i.e. + (5 x 1 2 ), + (5 x 2 2 ), + (5 x 4 2 ), + (5 x 8 2 ),..... So, missing term = 427 + (5 x 16 2 ) = 427 + 1280 = 1707.

The pattern is x 1, x 2, x 3, x 4,..... So, missing term = 24 x 5 = 120.

Let the missing terms of the series be x 1 and x 2 . Thus, the sequence 2, 15, 4, 12, 6, 7, x 1 x 2 is a combination of two series : I. 2, 4, 6, x 1 and II. 15, 12, 7, x 2 I consists of consecutive even numbers. So, missing term, x 1 = 8. The pattern in II is - 3, - 5,......So, missing term, x 2 = 7 - 7 = 0.

The pattern is + 1008. So, missing term - 6848 + 1008 = 7856.

Each term in the series is obtained by subtracting from the preceding term the number formed by the first three digits of the preceding term. So, missing term = 5242 - 524 = 4718.

Each term in the series, except the first two terms, is the product of the preceding two terms. So, missing term = 16 x 128 = 2048.

The pattern is + 1, x 3, + 1, x 3, + 1, x 3, + 1,..... So, missing term = 67 x 3 = 201.

1st: 0.5 2nd: 0.5 + 0.05 = 0.55 3rd: 0.55 + 0.10 = 0.65 4th: 0.65 + 0.15 = 0.80 Therefore, 5th: 0.80 + 0.20= 1 The pattern is + 0.05, + 0.10, + 0.15,..... So, missing term = 0.8 + 0.20 = 1.

The given sequence is a combination of two series : I. 0, 3, 8, 15, 24, ? and II. 2, 5, 10, 17, 26 The pattern in each one of I and II is + 3, + 5, + 7, + 9, ..... So, missing term = 24 + 11 = 35.

The pattern is + 2, + 4, + 2, + 4, ..... So, missing term = 25 + 4 = 29.

Each term in the series, except the first two terms, is the sum of the preceding two terms. So, missing term = 16 + 25 = 41.

The terms of the given series are (2 3 - 1), (3 3 - 1), (4 3 - 1), (5 3 - 1), (6 3 - 1), (7 3 - 1),..... So, missing term = (8 3 - 1) = (512 - 1) = 511.

The terms of the given series are 3 x l 2 , 3 x 2 2 , 3 x 3 2 , 3 x 4 2 , 3 x 5 2 , 3 x 6 2 ,..... So, missing term = 3 x 7 2 = 3 x 49 = 147.

The pattern is x 2 + 1, x 3 + 2, x 4 + 3,..... So, missing term = 95 x 5 + 4 = 479.

Each term at an even place in the series is the product of its two adjacent terms. Thus, if the missing term be x, then we have : 7 x x = 56 or x = 56 ÷ 7 = 8.

The given series consists of squares of consecutive prime numbers i.e. 2 2 , 3 2 , 5 2 ,....., 11 2 , 13 2 , 17 2 , 19 2 . So, missing term = 7 2 = 49.

1st number : 6 2nd number : 6 X 2 +1 = 13 3rd number : 13 X 2 + 2 = 28 4th number : 28 X 2 + 3 = 59 therefore 5th number : 59 x 2 + 4 = 122

The pattern is x 3. So, missing term = 108 x 3 = 324.

The given sequence is a combination of three series : I. 1st, 4th, 7th, 10th terms i.e. 8, 7, 6, ? II. 2nd, 5th, 8th, 11th terms i.e. 9, 10, 11, 12 III. 3rd, 6th, 9th terms i.e. 8, 9, 10 The pattern in I is - 1. So, missing term = 6 - 1 = 5.

Each number in the series is one more than twice the preceding number. So, missing term = (15 x 2) + 1 = 31.

Each number in the series is 2 less than thrice the preceding number. So, missing number = (10 x 3) - 2 = 28.

The pattern is + 4, + 8, + 12, + 16...... So, missing term = 41 + 20 = 61.

The pattern is - 66, - 55, - 44, - 33, - 22, ..... So, missing term = 105 - 11 = 94.

The pattern is + 3, + 5, + 7, + 9, ..... So, missing term = 28 + 11 = 39.

The pattern is ÷ 6, ÷ 5, ÷ 4, ÷ 3, ÷ 2. So, missing term = 960 - 5 = 192.

The given sequence is a combination of two series: I. 45, 47, 49, 51, 53 and II. 54, ?, 56, 57 Clearly, II consists of consecutive natural numbers, starting from 54. So, missing term = 55.

The pattern followed is : nth term + (n + l)th term + (n + 1) = (n + 2)th term. Thus, 1st term + 2nd term + 2 = 3rd term; 2nd term + 3rd term + 3 = 4th term and so on. So, missing term = 6th term = 4th term + 5th term + 5 = 24 + 41 + 5 = 70.

Each term in the series, except the first two terms, is 2 more than the sum of the preceding two terms. So, missing term = (42 + 70) + 2 = 114.

The pattern is + 8, + 10, + 12, + 14, ..... So, missing term = 70 + 18 = 88.

The pattern is x 3 + 4, x 4 + 4, x 5 + 4,..... So, missing term = 584 x 6 + 4 = 3508.

Each term in the series is obtained by adding 22 to the preceding term. So, 186 is wrong and must be replaced by (165 + 22) i.e. 187.

The terms of the series are products of two consecutive prime numbers i.e. (2 x 3), (3 x 5), (5 x 7), (7 x 11),..... So, 165 is wrong and must be replaced by (11 x 13) i.e. 143.

The correct pattern is + 5, + 8, + 11, + 14,..... So, 47 is wrong and must be replaced by (32 + 14) i.e. 46.

Each term of the series is obtained by multiplying the preceding term by 2. So, 96 is wrong and must be replaced by (64 x 2) i.e. 128.

The correct pattern is x 1 + 1, x 2 + 2, x 3 + 3, x 4 + 4,..... So, 32 is wrong and must be replaced by (10 x 3 + 3) i.e. 33.

The correct pattern is - 20, - 25, - 30,..... So, 0 is wrong and must be replaced by (30 - 35) i.e. - 5.

The terms of the series are (1 2 + 1), (2 2 + 1), (3 2 + 1), (4 2 + 1), (5 2 + 1), (6 2 + 1), (7 2 +1),..... So, 64 is wrong and must be replaced by (8 2 + 1) i.e. 65.

The correct pattern is + 1, - 2, + 3, - 4, + 5. So, 129 is wrong and must be replaced by (123 + 5) i.e. 128.