Practice MCQ Questions and Answer on Series Completion
131.
One term in the number series is wrong. Find out the wrong term.
2, 6, 24, 96, 285, 568, 567
(A) 6
(B) 24
(C) 285
(D) 567
Solution:
The correct pattern is x 6 - 6, x 5 - 5, x 4 - 4,..... So, 24 is wrong and must be replaced by (6 x 5 - 5) i.e. 25.
132.
Choose the missing terms out of the given alternatives : ajs , gpy , ? , sbk , yhq
(A) dmv
(B) mve
(C) oua
(D) qzi
Solution:
1st letter : a + 6 = g + 6 = m + 6 = s + 6 = y 2nd letter : j + 6 = p + 6 = v + 6 = b + 6 = h 3rd letter : s + 6 = y + 6 = e + 6 = k + 6 = q
133.
1, 1, 2, 6, 24, ?, 720
(A) 100
(B) 104
(C) 108
(D) 120
Solution:
The pattern is x 1, x 2, x 3, x 4,..... So, missing term = 24 x 5 = 120.
134.
0, 2, 8, 14, ?, 34
(A) 20
(B) 23
(C) 24.
(D) 25
Solution:
The pattern is + 2, + 6, + 6, + 10, + 10,..... So, missing term = 14 + 10 = 24.
135.
325, 259, 204, 160, 127, 105, ?
(A) 94
(B) 96
(C) 98
(D) 100
Solution:
The pattern is - 66, - 55, - 44, - 33, - 22, ..... So, missing term = 105 - 11 = 94.
136.
Choose the missing terms out of the given alternatives.
Z, X, S, I, R, R, ?, ?
(A) G,I
(B) J, I
(C) J,K
(D) K,M
Solution:
Note that the numbers representing the difference between the consecutive terms of the series again from a series - 2, 5, 10, 17, 26, 37, 50 - in which the pattern is +3, +5, +7, +9, +11, +13.
137.
6, 17, 39, 72, ?
(A) 83
(B) 94
(C) 116
(D) 127
Solution:
The pattern is + 11, + 22, + 33, ..... So, missing term = 72 + 44 = 116.
138.
One term in the number series is wrong. Find out the wrong term.
10, 26, 74, 218, 654, 1946, 5834
(A) 26
(B) 74
(C) 218
(D) 654
Solution:
The correct pattern is x 3 - 4. So, 654 is wrong and must be replaced by (218 x 3 - 4) i.e. 650.
139.
One term in the number series is wrong. Find out the wrong term.
1, 3, 12, 25, 48
(A) 3
(B) 12
(C) 25
(D) 48
Solution:
The terms of the series are (l2 - 02), (22 - l2), (42 - 22), (62 - 32) and (82 - 42). So, 25 is wrong and must be replaced by (62 - 32) i.e. 27.