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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