Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
31.
66, 36, 18, ?
A. 3 B. 6
C. 8 D. 9
Answer & Explanation
Answer: Option C
Explanation:
Each term in the series is the product of the digits of the preceding term.
So, missing term = 1 x 8 = 8.
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32.
In the series 3, 9, 15, …… what will be the 21st term?
A. 117 B. 121
C. 123 D. 129
Answer & Explanation
Answer: Option C
Explanation:
Clearly, 3 + 6 = 9, 9 + 6 = 15,…..
So, the series is an A.P. in which a = 3 and d = 6.
Therefore 21st term = a + (21 – 1) d = a + 20d = 3 + 20 x 6 = 123.
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33.
28, 33, 31, 36, ?, 39
A. 32 B. 34
C. 38 D. 40
Answer & Explanation
Answer: Option B
Explanation:
The pattern is + 5, – 2, + 5, – 2,…..
So, missing term = 36 – 2 = 34.
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34.
1, 9, 25, 49, 81, ?
A. 100 B. 112
C. 121 D. 144
Answer & Explanation
Answer: Option C
Explanation:
The series consists of squares of consecutive odd numbers
i.e. 12, 32, 52, 72, 92,…..
So, missing term = 112 = 121.
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35.
1, 9, 25, 49, ?, 121
A. 64 B. 81
C. 91 D. 100
Answer & Explanation
Answer: Option B
Explanation:
The given series consists of squares of consecutive odd numbers
i.e. 12, 32, 52, 72,…..
So, missing term = 92 = 81.