Find the missing number: 9, 11, 15, __ , 29, 39,

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വിട്ടുപോയത് കണ്ടുപിടിക്കുക: 9, 11, 15, __ , 29, 39

A19

B20

C17

D21

Answer:

D. 21

Read Explanation:

9 + 2 = 11 11 + 4 = 15 15 + 6 = 21 21 + 8 = 29 29 + 10 = 39

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