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Summation by Sigma Method

Complete the ...

Question

Complete the following series by replacing the question mark.
1, 1, 2, 3, 5, 8, 13, ?

A

20

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B

21

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C

28

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D

36

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Solution

The correct option is B 21
Each term is the sum of two preceding terms.
So next term will be 8 +13 = 21.
So, option B

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