Practice MCQ Questions and Answer on Series Completion
61.
Find the missing number / letters / word from the given alternative: AYBZC, DWEXF, GUHVI, JSKTL, ?
(A) MQORN
(B) MQNRO
(C) NQMOR
(D) QMONR
Solution:
Ist letter : A + 3 = D + 3 = G + 3 = J + 3 = M 2nd letter : Y - 2 = W - 2 = U - 2 = S - 2 = Q 3rd letter : B + 3 = E + 3 = H + 3 = K + 3 = N 4th letter : Z - 2 = X - 2 = V - 2 = T - 2 = R 5th letter : C + 3 = F + 3 = I + 3 = L + 3 = O
62.
Choose the missing terms out of the given alternatives.
GH, JL, NQ, SW, YD, ?
(A) EJ
(B) FJ
(C) EL
(D) FL
63.
Choose the missing terms out of the given alternatives.
R, U, X, A, D, ?
(A) F
(B) G
(C) H
(D) I
64.
6, 13, 25, 51, 101, ?
(A) 201
(B) 202
(C) 203
(D) 205
Solution:
The pattern is x 2 + 1, x 2 - 1, x 2 + 1, x 2 - 1,..... So, missing term = 101 x 2 + 1 = 203.
65.
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
66.
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.
67.
One term in the number series is wrong. Find out the wrong term.
5, 27, 61, 122, 213, 340, 509
(A) 27
(B) 61
(C) 122
(D) 509
Solution:
The terms of the series are (23 - 3), (33 - 3), (43 - 3), (53 - 3), (63 - 3), (73 - 3), (83-3). So, 27 is wrong and must be replaced (33 - 3) i.e. 24.
68.
Choose the missing terms out of the given alternatives : A, G, L, P, S ?
(A) U
(B) W
(C) X
(D) Y
Solution:
A + 6 = G + 5 = L + 4 = P + 3 = S + 2 = U
69.
Choose the missing terms out of the given alternatives : A, B, B, D, C, F, D, D, H. E, ?, ?
(A) E, F
(B) F, G
(C) F, I
(D) J, F
Solution:
The given sequence is a combination of two series:I: 1st , 3rd, 5th, 7th, 9th, 11th terms i.e., A, B, C, D, E, ?II: 2nd, 4th, 6th, 8th, 10th terms i.e., B, D, F, H, ?Clearly , I: consists of consecutive letters while II: consists of alternate letters. So, the missing letter in I is F, while that in II is J.So, the missing terms i.e., 10th and 11th terms re J and F respectively.