Practice MCQ Questions and Answer on Series Completion
91.
One term in the number series is wrong. Find out the wrong term. 0, 2, 3, 5, 8, 10, 15, 18, 24, 26, 35
(A) 18
(B) 24
(C) 26
(D) 10
Solution:
The given sequence is a combination of two series: I. 0, 3, 8, 15, 24, 35 and II. 2, 5, 10, 18, 26 The pattern in both I and II is + 3, + 5, + 7, + 9,..... So, in II, 18 is wrong and must be replaced by (10 + 7) i.e. 17.
92.
One term in the number series is wrong. Find out the wrong term.
16, 22, 30, 45, 52, 66
(A) 30
(B) 45
(C) 52
(D) 66
Solution:
The correct pattern is + 6, + 8, + 10, + 12, + 14. So, 45 is wrong and must be replaced by (30 + 10) i.e. 40.
93.
One term in the number series is wrong. Find out the wrong term.
2, 3, 4, 4, 6, 8, 9, 12, 16
(A) 3
(B) 6
(C) 9
(D) 12
Solution:
The given sequence is a combination of three series: I. 1st, 4th, 7th terms i.e. 2, 4, 9,..... II. 2nd, 5th, 8th terms i.e. 3, 6, 12,..... III. 3rd, 6th, 9th terms i.e. 4, 8, 16,..... In each one of I, II and III, each term is twice the preceding term. So, 9 is wrong and must be replaced by (4 x 2) i.e. 8.
94.
Choose the missing terms out of the given alternatives : 2Z5, 7Y7, 14X9, 23W11, 34V13, ?
(A) 27U24
(B) 45U15
(C) 47U15
(D) 47V14
Solution:
1st number : 2 + 5 = 7 + 7 = 14 + 9 = 23 + 11 = 34 + 13 = 47 Middle letter : Z - 1 = Y - 1 = X - 1 = W - 1 = V - 1 = U 3rd number : 5 + 2 = 7 + 2 = 9 + 2 = 11 + 2 = 13 + 2 = 15
95.
In the series 2, 6, 18, 54, ...... what will be the 8th term ?
(A) 4370
(B) 4374
(C) 7443
(D) 7434
Solution:
Clearly, 2 x 3 = 6, 6 x 3 = 18, 18 x 3 = 54,..... So, the series is a G.P. in which a = 2, r = 3. Therefore 8th term = ar8-1 = ar7 = 2 x 37 = (2 x 2187) = 4374.
96.
Choose the missing terms out of the given alternatives : Y, W, T, P, K, E, X, ?, ?
(A) G, H
(B) P, G
(C) R, G
(D) S, R
Solution:
Y - 2 = W - 3 = T - 4 = P - 5 = K - 6 = E - 7 = X - 8 = P - 9 = G
97.
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
98.
Choose the missing terms out of the given alternatives.
R, U, X, A, D, ?
(A) F
(B) G
(C) H
(D) I
99.
1, 3, 4, 8, 15, 27, ?
(A) 37
(B) 44
(C) 50
(D) 55
Solution:
The sum of any three consecutive terms of the series gives the next term. So, missing number = 8 + 15 + 27 = 50.
100.
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.