Find the missing number.
2, 3, 5, 8, __, 21

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Solution

The correct option is B 13
The pattern is:
2, 3, 5, 8, __, 21

We can observe that,
2 + 3 = 5
3 + 5 = 8
The sum of the previous two terms gives the next term.
So, the missing term should be the sum of 5 and 8 which is 13.

Hence, 8 + 13 = 21.

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