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Question

Identify the term that will replace the ?
$$1, 6, 15, ?, 45, 66, 91$$


A
25
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B
26
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C
27
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D
28
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Solution

The correct option is B $$28$$
Clearly, the given sequence follows the pattern
+ 5, +9, + 13, + 17, + 21, + 25,.
Thus , 1 + 5 = 6, 6 + 9 = 15,..
So, missing term = 15 + 13 = 28.
Hence, the answer is (D).

Logical Reasoning

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