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

25

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26

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27

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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).

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