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Other Number Patterns

Find out the ...

Question

Find out the missing number in the following sequence :
1, 3, 3, 6, 7, 9, ?, 12, 21.

A

10

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B

11

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C

12

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D

13

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Solution

The correct option is D 13
Clearly, the given sequence is a combination of two series :
I. 1, 3, 7, ?, 21 and
II. 3, 6, 9, 12
The pattern followed in I is + 2, + 4, ...; and
the pattern followed in IIis + 3.
Thus, missing number = 7 + 6 = 13.
Hence, the answer is (d).

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