First No. is 3 and second is 4 so the difference is 1 Now the 3 rd no is 6 so d diff is 2(6-4) next no is 9
and hence difference is 3(9-6) now next no in series is 13 and difference is 4(13-9) so
this is a progressive a.p where differences increases by 1 and next tym so
the difference now will be 5, and adding it to 13 you will get 18

## Find the next number in the series 3, 4, 6, 9, 13,?

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