Practice MCQ Questions and Answer on Series Completion
31.
120, 99, 80, 63, 48, ?
(A) 35
(B) 38
(C) 39
(D) 40
Solution:
The pattern is - 21, - 19, - 17, - 15,..... So, missing term = 48 - 13 = 35.
32.
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
33.
Choose the missing terms out of the given alternatives : J2Z, K4X, I7V, ? , H16R, M22P
(A) I11T
(B) L11S
(C) L12T
(D) L11T
Solution:
The first letters in odd numbered terms from series. J - 1 = I - 1 = H and in even numbered terms from series K + 1 = L + 1 = MMiddle Number : 2 + 2 = 4 + 3 = 7 + 4 = 11 + 5 = 16 + 6 = 223rd letter : Z - 2 = X - 2 = V - 2 = T - 2 = R - 2 = P
34.
One term in the number series is wrong. Find out the wrong term.
105, 85, 60, 30, 0, - 45, - 90
(A) 105
(B) 60
(C) 0
(D) -45
Solution:
The correct pattern is - 20, - 25, - 30,..... So, 0 is wrong and must be replaced by (30 - 35) i.e. - 5.
35.
5824, 5242, ?, 4247, 3823
(A) 4467
(B) 4718
(C) 4856
(D) 5164
Solution:
Each term in the series is obtained by subtracting from the preceding term the number formed by the first three digits of the preceding term. So, missing term = 5242 - 524 = 4718.
36.
Choose the missing terms out of the given alternatives :S-4, F-6, H-8, J-10, ?, ?
(A) K-12, M-13
(B) L-12, M-14
(C) L-12, N-14
(D) K-12, M-14
Solution:
The letters in the series are alternative and the numbers indicate their position in the English alphabet from the beginning.
37.
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.
38.
Choose the missing terms out of the given alternatives.
AYD, BVF, DRH, ?, KGL
(A) FMI
(B) GMJ
(C) GLJ
(D) HLK
39.
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.
40.
Choose the missing terms out of the given alternatives : 2, A, 9, B, 6, C, 13, D, ?
(A) 9
(B) 10
(C) 12
(D) 19
Solution:
The given sequence is a combination of two series:I: 2, 9, 6, 13, ? and II: A, B, C, DThe pattern in I: is : 2 + 7 9 - 3 6 + 7 13 - 3 10So, the missing term is 10.