Practice MCQ Questions and Answer on Series Completion

81.

Choose the missing terms out of the given alternatives.
Z, U, Q, ?, L

• (A) I
• (B) K
• (C) M
• (D) N

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82.

4, 10, ?, 82, 244, 730

• (A) 24
• (B) 28
• (C) 77
• (D) 218

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 Each number in the series is 2 less than thrice the preceding number. So, missing number = (10 x 3) - 2 = 28.

83.

Find the term which does not fit into the series: 1CC, 5FU, 9IT, 15LS, 17OR

• (A) 5FU
• (B) 15LS
• (C) 9IT
• (D) 17OR

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 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.

84.

20, 20, 19, 16, 17, 13, 14, 11, ?, ?

• (A) 10, 10
• (B) 10, 11
• (C) 13, 14
• (D) 13, 16

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 Let the missing terms of the series be x1 and x2. Thus, the sequence 20, 20, 19, 16, 17, 13, 14, 11, xv x2 is a combination of two series : I. 20, 19, 17, 14, x1 and II. 20, 16, 13, 11, x2 The pattern in I is - 1, - 2, - 3,......So, missing term, x1 = 14 - 4 = 10. The pattern in II is - 4, - 3, - 2,......So, missing term, x2 = 11 - 1 = 10.

85.

One term in the number series is wrong. Find out the wrong term.
15, 16, 22, 29, 45, 70

• (A) 16
• (B) 22
• (C) 45
• (D) 70

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 The correct pattern is + 1, + 4, + 9, + 16, + 25 i.e. + 12, + 22, + 32, + 42, + 52. So, 22 is wrong and must be replaced by (16 + 4) i.e. 20.

86.

6, 11, 21, 36, 56, ?

• (A) 42
• (B) 51
• (C) 81
• (D) 91

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 The pattern is + 5, + 10, + 15, + 20, ... So, missing term = 56 + 25 = 81.

87.

6, 13,28,59,?

• (A) 111
• (B) 113
• (C) 114
• (D) 122

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 1st number : 6 2nd number : 6 X 2 +1 = 13 3rd number : 13 X 2 + 2 = 28 4th number : 28 X 2 + 3 = 59 therefore 5th number : 59 x 2 + 4 = 122

88.

6, 17, 39, 72, ?

• (A) 83
• (B) 94
• (C) 116
• (D) 127

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 The pattern is + 11, + 22, + 33, ..... So, missing term = 72 + 44 = 116.

89.

Choose the missing terms out of the given alternatives : a, d, c, f, ? , h, g, ? , i

• (A) e, j
• (B) e, k
• (C) f, j
• (D) j, e

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 a + 3 = d - 1 = c + 3 = f - 1 = e + 3 = h - 1 = g + 3 = j - 1 = i

90.

Choose the missing terms out of the given alternatives.
Y, B, T, G, O, ?

• (A) N
• (B) M
• (C) L
• (D) K

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 The given sequence is a combination of two series : I. Y,T, O and II. B, G, ? I consists of 2nd, 7th and 12th letters from the end of the English alphabet, while II consists of 2nd, 7th and 12th letters from the beginning of the English alphabet. So, the missing letter in II is the 12th letter from the beginning of the English alphabet, which is L.