Practice MCQ Questions and Answer on Series Completion
81.
One term in the number series is wrong. Find out the wrong term.
3, 4, 10, 32, 136, 685, 4116
(A) 10
(B) 32
(C) 136
(D) 4116
Solution:
The correct pattern is x 1 + 1, x 2 + 2, x 3 + 3, x 4 + 4,..... So, 32 is wrong and must be replaced by (10 x 3 + 3) i.e. 33.
82.
4, 9, 25, ?, 121, 169, 289, 361
(A) 49
(B) 64
(C) 81
(D) 87
Solution:
The given series consists of squares of consecutive prime numbers i.e. 22, 32, 52,....., 112, 132, 172, 192. So, missing term = 72 = 49.
83.
Consider the following series: A B C D .... X Y Z | Y X ...... B A | B C D ...... Y Z | Y X ..... C B A | B C ........ Y Z .... Which letter occupies the 1000th positing in the above series ?
(A) B
(B) C
(C) X
(D) Y
Solution:
We have 3 patterns:I: A B C D ... X Y Z, which occurs only once. Y X ... B A, which repeats alternately.B C ... Y Z, which repeats alternately.Now, I: has 26 terms.So, number of terms before the desired term = (999 - 26) = 973. Each of the patterns which occurs after I: has 25 letters. Now, 973 ÷ 25 gives quotient = 38 and remainder = 23. Thus, the 1000th trem of the given series is the 24th term of the 39th pattern after I:. Clearly, the 39th pattern is II: and its 24th term is B.
84.
Choose the missing terms out of the given alternatives : ABD , DGK, HMS, MTB, SBL, ?
(A) XKW
(B) ZAB
(C) ZKU
(D) ZKW
Solution:
1st letter : A + 3 = D + 4 = H + 5 = M + 6 = S + 7 = Z 2nd letter : B + 5 = G + 6 = M + 7 = T + 8 = B + 9 = K 3rd letter : D + 7 = K + 8 = S + 9 = B + 10 = L + 11 = W
85.
Choose the missing terms out of the given alternatives : ATTRIBUTION, TTRIBUTIO, RIBUTIO, IBUTI, ?
(A) IBU
(B) UT
(C) UTI
(D) BUT
Solution:
In the first step, one letter from the beginning and one from the end of a term are removed to give the next term. In the second step, two letters from the beginning of a term are removed. These two steps are repeated alternately.
86.
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.
87.
Find the term which does not fit into the series: 1CC, 5FU, 9IT, 15LS, 17OR
(A) 5FU
(B) 15LS
(C) 9IT
(D) 17OR
Solution:
1st letter :1 + 4 = 5 + 4 = 9 + 4 = 13 + 4 = 17 2nd letter :C + 3 = F + 3 = I + 3 = L + 3 = O 3rd letter :V - 1 = U - 1 = T - 1 = S - 1 = R Thus, the term 15LS is wrong and must be replaced by 13LS.
88.
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
89.
Choose the missing terms out of the given alternatives.
AZ, CX, FU, ?
(A) IR
(B) IV
(C) JQ
(D) KP
90.
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