Question

find the next term of the given serise 12,15,21,30,42,57​

Answer 1

See the trick is as follows

We see that the numbers keep on increasing on the basis of a factor of 3

See

12 + 3 = 15

15 + 3 + 3 = 21

21 + 3 + 3 + 3 = 30

30 + 3 + 3 + 3 + 3 = 42

42 + 3 + 3 + 3 + 3 + 3 = 57

.....

And so on this continues

So the next number is

57 + 3 + 3 + 3 + 3 + 3 + 3 = 65

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