Practice MCQ Questions and Answer on Series Completion
151.
20, 20, 19, 16, 17, 13, 14, 11, ?, ?
(A) 10, 10
(B) 10, 11
(C) 13, 14
(D) 13, 16
Solution:
Let the missing terms of the series be x1 and x2. Thus, the sequence 20, 20, 19, 16, 17, 13, 14, 11, xv x2 is a combination of two series : I. 20, 19, 17, 14, x1 and II. 20, 16, 13, 11, x2 The pattern in I is - 1, - 2, - 3,......So, missing term, x1 = 14 - 4 = 10. The pattern in II is - 4, - 3, - 2,......So, missing term, x2 = 11 - 1 = 10.
152.
Choose the correct order of the given alternative : AFI, JOR, MRU, ?
(A) GJU
(B) HMP
(C) MPO
(D) RJL
Solution:
Each term follow these rules A + 5 = F F + 3 = I J + 5 = O O + 3 = R M + 5 = R R + 3 = U H + 5 = M M + 3 = P So Correct answer is HMP
153.
One term in the number series is wrong. Find out the wrong term.
6, 15, 35, 77, 165, 221
(A) 35
(B) 77
(C) 165
(D) 15
Solution:
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.
154.
One term in the number series is wrong. Find out the wrong term.
46080, 3840, 384, 48, 24, 2, 1
(A) 384
(B) 48
(C) 24
(D) 2
Solution:
The correct pattern is ÷ 12, ÷ 10, ÷ 8,÷ 6,..... So, 24 is wrong and must be replaced by (48 + 6) i.e. 8.
155.
Choose the missing terms out of the given alternatives.
ADVENTURE, DVENTURE, DVENTUR, ?, VENTU
(A) DVENT
(B) VENTURE
(C) VENTUR
(D) DVENTU
Solution:
One letter from the beginning and one from the end of a term are removed, one by one, in alternate steps.
156.
One term in the number series is wrong. Find out the wrong term.
2, 6, 24, 96, 285, 568, 567
(A) 6
(B) 24
(C) 285
(D) 567
Solution:
The correct pattern is x 6 - 6, x 5 - 5, x 4 - 4,..... So, 24 is wrong and must be replaced by (6 x 5 - 5) i.e. 25.
157.
4, 12, 36, 108, ?
(A) 144
(B) 216
(C) 304
(D) 324
Solution:
The pattern is x 3. So, missing term = 108 x 3 = 324.
158.
6, 11, 21, 36, 56, ?
(A) 42
(B) 51
(C) 81
(D) 91
Solution:
The pattern is + 5, + 10, + 15, + 20, ... So, missing term = 56 + 25 = 81.
159.
One term in the number series is wrong. Find out the wrong term.
8, 13, 21, 32, 47, 63, 83
(A) 13
(B) 21
(C) 32
(D) 47
Solution:
The correct pattern is + 5, + 8, + 11, + 14,..... So, 47 is wrong and must be replaced by (32 + 14) i.e. 46.
160.
Choose the missing terms out of the given alternatives : UPI, ?, ODP, MBQ, IAW
(A) RHJ
(B) SHJ
(C) SIJ
(D) THK
Solution:
1st letter : U - 2 = S - 4 = O - 2 = M - 4 = I 2nd letter : P - 8 = H - 4 = D - 2 = B - 1 = A 3rd letter : I + 1 = J + 6 = P + 1 = Q + 6 = W