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Question

Find the missing number in the sequence.

1, 2, 3, 5, 8, __, 21


A

15

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B

13

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C

17

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D

None of these

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Solution

The correct option is B

13


Each term in the series is the sum of the preceding two terms.

Thus, 1 + 2 = 3; 2 + 3 = 5; 3 + 5 = 8 and so on.

Missing number = 5 + 8 = 13.


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