Practice MCQ Questions and Answer on Series Completion
141.
1, 2, 3, 6, 9, 18, ?, 54
(A) 18
(B) 27
(C) 36
(D) 81
Solution:
The pattern is x 2, x 3/2, x 2, x 3/2, x 2,..... So, missing term = 18 x 3/2 = 27.
142.
One term in the number series is wrong. Find out the wrong term.
89, 78, 86, 80, 85, 82, 83
(A) 83
(B) 82
(C) 86
(D) 78
Solution:
The correct pattern is - 11, + 9, - 7, + 5, - 3, + 1. So, 86 is wrong and must be replaced by (78 + 9) i.e. 87.
143.
Choose the missing terms out of the given alternatives : Z, U, Q, ?, L
(A) I
(B) K
(C) M
(D) N
Solution:
Z - 5 = U - 4 = Q - 3 = N - 2 = L
144.
Which term of the series 5, 8, 11, 14,.....is 320?
(A) 104th
(B) 105th
(C) 106th
(D) 64th
Solution:
Clearly, 5 + 3 = 8, 8 + 3 = 11, 11 + 3 = 14, ..... So, the series is an A.P. in which a - 5 and d = 3. Let 320 be the nth term of the series. Then, 320 = 5 + (n - 1) x 3 or (n - 1) = 105 or n = 106.
145.
Choose the missing terms out of the given alternatives.
M, N, O, L, R, I, V, ?
(A) A
(B) E
(C) F
(D) H
Solution:
The given sequence is a combination of two series: I. M, O, R, V and II. N, L, I, ?
146.
8, 9, 8, 7, 10, 9, 6, 11, 10, ?, 12
(A) 5
(B) 7
(C) 8
(D) 11
Solution:
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.
147.
4, 10, ?, 82, 244, 730
(A) 24
(B) 28
(C) 77
(D) 218
Solution:
Each number in the series is 2 less than thrice the preceding number. So, missing number = (10 x 3) - 2 = 28.
148.
Choose the missing terms out of the given alternatives : P E R P E N D I C U L A R, E R P E N D I C L A , R P E N D I C U L , ?
(A) PENDICUL
(B) PENDIC
(C) ENDIC
(D) ENDICU
Solution:
Answer & Solution Answer: Option E Solution: Each term of the series is obtained by removing two letters from the preceding term- one from the beginning and one from the end. So, the missing term is PENDICU.
149.
Choose the missing terms out of the given alternatives : GH, JL, NQ, SW, YD, ?
(A) EJ
(B) FJ
(C) EL
(D) FL
Solution:
1st letter : G + 3 = J + 4 = N + 5 = S + 6 = Y + 7 = F 2nd letter : H + 4 = L + 5 = Q + 6 = W + 7 = D + 8 = L
150.
Choose the missing terms out of the given alternatives.
PERPENDICULAR, ERPENDICULA, RPENDICUL, ?
(A) PENDICUL
(B) PENDIC
(C) ENDIC
(D) ENDICU
Solution:
Answer & Solution Answer: Option E Solution: Each term of the series is obtained by removing two letters from the preceding term one from the beginning and one from the end, So, the missing term is PENDICU.