Practice MCQ Questions and Answer on Number Series Completion
11.
201, 202, 204, 207, ... What number should come next?
(A) 205
(B) 208
(C) 210
(D) 211
Solution:
In this addition series, 1 is added to the first number; 2 is added to the second number; 3 is added to the third number; 4 is added to the fourth number; and go on.
12.
21, 25, 18, 29, 33, 18, ... choose which pair of numbers comes next?
(A) 43, 18
(B) 41, 44
(C) 37, 18
(D) 37, 41
Solution:
This is a simple addition series with a random number, 18, interpolated as every third number. In the series, 4 is added to each number except 18, to arrive at the next number.
13.
Find the missing term: 10, 100, 200, 310. ?
(A) 400
(B) 410
(C) 420
(D) 430
Solution:
The pattern is + 90, + 100, + 110...... So, the missing term = 310 + 120 = 430
14.
3, 4, 7, 8, 11, 12, ... What number should come next?
(A) 7
(B) 10
(C) 14
(D) 15
Solution:
This alternating addition series begins with 3; then 1 is added to give 4; then 3 is added to give 7; then 1 is added, and so on.
15.
1.5, 2.3, 3.1, 3.9, ... What number should come next?
(A) 4.2
(B) 4.4
(C) 4.7
(D) 5.1
Solution:
In this simple addition series, each number increases by 0.8.
16.
Find the missing term: 3, 10, 101, ?
(A) 10101
(B) 10201
(C) 10202
(D) 11012
Solution:
Each term in the series is obtained by adding 1 to the square of the preceding term.So, missing term = (101)2 + 1 = 10202
17.
In a given series one term is wrong or missing term: 0, 3, 8, 15, 24, 33
(A) 8
(B) 15
(C) 26
(D) 33
Solution:
The correct pattern is + 3, + 5, + 7, + 9, + 11.So, 33 is wrong and must be replaced by (24 + 11) i.e., 35.
18.
Find the missing term: 165, 195, 255, 285, 345, ?
(A) 375
(B) 390
(C) 420
(D) 435
Solution:
Each number of the series is 15 multiplied by a prime number i.e., 15 × 11, 15 × 13, 15 × 17, 15 × 19, 15 × 23,.............. So, missing term = 15 × 29 = 435
19.
8, 6, 9, 23, 87 , ... What number should come next?
(A) 128
(B) 226
(C) 324
(D) 429
Solution:
8 x 1 - 2 = 6 6 x 2 - 3 = 9 9 x 3 - 4 = 23 23 x 4 - 5 = 87 87 x 5 - 6 = 429 ...
20.
Find the missing term: 8, 28, 116, 584 , ?
(A) 1752
(B) 3502
(C) 3504
(D) 3508
Solution:
The pattern is x3+4, x4+4, x5+4,...............So, missing term=584x6+4=3508