Practice MCQ Questions and Answer on Series Completion
1.
Choose the missing terms out of the given alternatives : Z, W, S, P, L, I, E ?
(A) B
(B) D
(C) F
(D) K
Solution:
Z - 3 = W - 4 = S - 3 = P - 4 = L - 3 = I - 4 = E - 3 = B
2.
Choose the missing terms out of the given alternatives : BMX, DNW, FOU, ?
(A) GHO
(B) GPS
(C) HPS
(D) HPT
Solution:
1st letter : B + 2 = D + 2 = F + 2 = H 2nd letter : M + 1 = N + 1 = O + 1 = P 3rd letter : X - 1 = W - 2 = U - 1 = T
3.
3, 12,27,48, 75, 108,?
(A) 147
(B) 162
(C) 183
(D) 192
Solution:
The terms of the given series are 3 x l2, 3 x 22, 3 x 32, 3 x 42, 3 x 52, 3 x 62,..... So, missing term = 3 x 72 = 3 x 49 = 147.
4.
One term in the number series is wrong. Find out the wrong term.
93, 309, 434, 498, 521, 533
(A) 309
(B) 434
(C) 498
(D) 521
Solution:
The correct pattern is + 63, + 53, + 43, + 33, ..... So, 521 is wrong and must be replaced by (498 + 33) i.e. 525.
5.
3, 7, 15, ?, 63, 127
(A) 30
(B) 31
(C) 47
(D) 52
Solution:
Each number in the series is one more than twice the preceding number. So, missing term = (15 x 2) + 1 = 31.
6.
Choose the missing terms out of the given alternatives.
AB, DEF, HIJK, ?, STUVWX
(A) LMNO
(B) LMNOP
(C) MNOPQ
(D) QRSTU
Solution:
The number of letters in the terms of the given series increases by one at each step. The first letter of each term is two steps ahead of the last letter of the preceding term. However, each term consists of consecutive letters in order.
7.
2, 3, 5,7,11,?, 17
(A) 12
(B) 13
(C) 14
(D) 15
Solution:
Clearly, the given series consists of prime numbers starting from 2. So, the missing term is the prime number after 11, which is 13.
8.
Choose the missing terms out of the given alternatives.
AZ, CX, FU, ?
(A) IR
(B) IV
(C) JQ
(D) KP
9.
One term in the number series is wrong. Find out the wrong term.
24576, 6144, 1536, 386, 96, 24
(A) 96
(B) 386
(C) 1536
(D) 6144
Solution:
Each term of the series is obtained by dividing the preceding term by 4. So, 1536 is wrong and must be replaced by (1536 + 4) i.e. 384.
10.
Choose the missing terms out of the given alternatives : PMT, OOS, NQR, MSQ, ?
(A) LUP
(B) LVP
(C) LVR
(D) LWP
Solution:
1st letter : P - 1 = O - 1 = N - 1 = M - 1 = L 2nd letter : M + 2 = O + 2 = Q + 2 = S + 2 = U 3rd letter : T - 1 = S - 1 = R - 1 = Q - 1 = P