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Question

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



Your Answer
A

26

Correct Answer
B

25

Your Answer
C

27

Your Answer
D

21

Your Answer
E

None of these.


Solution

The correct option is E

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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