Question

Pls answer this question
find the next number in series
I)13,16,22,33,51,?
ii)5,6,9,15?,40

Do answer with explanation

pls​

Answer 1

first answer is 78⬆️⬆️

ii) 5, 6, 9, 15, ?, 40

As per my analysis the differences are

+1, +3, +6…….. I.e.

+(1), +(1+2), +(1+2+3), ………

So according to that the series will be as followes

5

5+1 =6

6+(1+2)=9

9+(1+2+3)=15

15+(1+2+3+4)=25

25+(1+2+3+4+5)=40

5, 6, 9, 15, 25, 40 is the actual series.