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What is the next number? 3 ,4, 6, 9 ,13

What is the next number? 3 ,4, 6, 9 ,13

Explanation

From the given sequence, we see that the pattern followed is:

3 + 1 = 4

4 + 2 = 6

6 + 3 = 

9 + 4 = 13

13 + 5 = 18