Practice MCQ Questions and Answer on Series Completion
141.
Choose the missing terms out of the given alternatives : W-144, ?, S-100, Q-81, O-64
(A) U-121
(B) U-122
(C) V-121
(D) V-128
Solution:
Letters : W - 2 = U - 2 = S - 2 = Q - 2 = O Numbers : 144 (122 ) → 121 (112 ) → 100 (102 ) → 81 (92 ) → 64 (82 )
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 : DEF , HIJ , MNO , ?
(A) STU
(B) RST
(C) RTV
(D) SRQ
Solution:
1st letter : D + 4 = H + 5 = M + 6 = S 2nd letter : E + 4 = I + 5 = N + 6 = T 3rd letter : F + 4 = J + 5 = O + 6 = U
144.
One term in the number series is wrong. Find out the wrong term.
93, 309, 434, 498, 521, 533
(A) 309
(B) 434
(C) 498
(D) 521
Solution:
The correct pattern is + 63, + 53, + 43, + 33, ..... So, 521 is wrong and must be replaced by (498 + 33) i.e. 525.
145.
11, 13, 17, 19, 23, 25, ?
(A) 26
(B) 27
(C) 29
(D) 37
Solution:
The pattern is + 2, + 4, + 2, + 4, ..... So, missing term = 25 + 4 = 29.
146.
Choose the missing terms out of the given alternatives.
Z, U, Q, ?, L
(A) I
(B) K
(C) M
(D) N
147.
One term in the number series is wrong. Find out the wrong term.
1, 5, 9, 15, 25, 37, 49
(A) 9
(B) 15
(C) 25
(D) 37
Solution:
The terms of the given series are 12, (22 + 1), 32, (42..+ 1), 52, (62 + 1), 72. So, 15 is wrong and must be replaced by (42 + 1) i.e. 17.
148.
Choose the missing terms out of the given alternatives.
ejo tyd ins xch ?
(A) nrw
(B) mrw
(C) msx
(D) nsx
Solution:
There is a gap of four letters between the first and second, the second and third letters of each term, and also between the last letter of a term and the first letter of the next term.
149.
22, 24, 28, ?, 52, 84
(A) 36
(B) 38
(C) 42
(D) 46
Solution:
The pattern is + 2, + 4, + 8, + 16,..... So, missing term = 28 + 8 = 36.
150.
Choose the missing terms out of the given alternatives : AZ , CX , FU , ?
(A) IR
(B) IV
(C) JQ
(D) KP
Solution:
1st letter : A + 2 = C + 3 = F + 4 = J 2nd letter : Z - 2 = X - 3 = U - 4 = J