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Consecutive Numbers

Find the next...

Question

Find the next number in the pattern:
1, 3, 7, 9, 13

A

16

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B

14

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C

17

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D

15

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Solution

The correct option is D 15
The sequence follows:
1, 3, 7, 9, 13

We can observe
3 - 1 = 2
7 - 3 = 4
9 - 7 = 2
13 - 9 = 4

The consecutive terms are added with 2 and 4 alternatively.
So, the next term will be 13 + 2 = 15.

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