Find the missing term in the sequence
8, 11, 21, 15, 18, 21, 22, __

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None of these.

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Solution

The correct option is B
25

This is an alternating addition series, with a random number, 21, interpolated as every third number. The addition series alternates between adding 3 and adding 4. The number 21 appears after each number arrived at by adding 3.

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