Practice MCQ Questions and Answer on Series Completion
161.
45, 54, 47, ?, 49, 56, 51, 57, 53
(A) 48
(B) 50
(C) 55
(D) None of these
Solution:
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.
162.
Choose the missing terms out of the given alternatives.
Z, ?, T, ?, N, ?, H, ?, B
(A) W, Q, K, E
(B) W, R, K, E
(C) X, Q, K, E
(D) X, R, K, E
163.
2, 3, 3, 5, 10, 13, ?, 43, 172, 177
(A) 23
(B) 38
(C) 39
(D) 40
Solution:
The pattern is + 1, x 1, + 2, x 2, + 3, x 3, + 4, x 4, + 5. So, missing term = 13 x 3 = 39.
164.
Choose the missing terms out of the given alternatives : 2A11, 4D13, 12G17, ?
(A) 36I19
(B) 36J21
(C) 48J21
(D) 48J23
Solution:
1st number : 2 × 2 = 4 × 3 = 12 × 4 = 48 Middle letter : A + 3 = D + 3 = G + 3 = J 3rd number : 11 + 2 = 13 + 4 = 17 + 6 = 23
165.
2, 8, 16, 128, ?
(A) 2042
(B) 2046
(C) 2048
(D) 2056
Solution:
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.
166.
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
167.
One term in the number series is wrong. Find out the wrong term.
325, 259, 202, 160, 127, 105, 94
(A) 94
(B) 127
(C) 202
(D) 259
Solution:
The correct pattern is - 66, - 55, - 44, - 33, - 22, - 11. So, 202 is wrong and must be replaced by (259 - 55) i.e. 204.
168.
Choose the missing terms out of the given alternatives : N5V, K7T, ?, E14P, B19N
(A) H9R
(B) H10Q
(C) H10R
(D) I10R
Solution:
1st letter : N - 3 = K - 3 = H - 3 = E - 3 = B Middle letter : 5 + 2 = 7 + 3 = 10 + 4 = 14 + 5 = 19 2nd letter : V - 2 = T - 2 = R - 2 = P - 2 = N
169.
3F, 6G, 11I, 18L, ?
(A) 21O
(B) 25N
(C) 25P
(D) 27P
Solution:
Numbers : 3 + 3 = 6 + 5 = 11 + 7 = 18 + 9 = 27Letters : F + 1 = G + 2 = I + 3 = L + 4 = P
170.
2, 1, 2, 4, 4, 5, 6, 7, 8, 8, 10, 11, ?
(A) 9
(B) 10
(C) 11
(D) 12
Solution:
The given sequence is a combination of three series : I. 1st, 4th, 7th, 10th, 13th terms i.e. 2, 4, 6, 8, ? II. 2nd, 5th, 8th, 11th terms i.e. 1, 4, 7, 10 III. 3rd, 6th, 9th, 12th terms i.e. 2, 5, 8, 11 Clearly, I consists of consecutive even numbers. So, the missing term is 10.