Question

in the secuence 4,13,and 38 the 4th no is?

Answer 1

the difference between 1st and 2nd is 9 which is the square of 3
the difference between 2nd and 3rd is 25 which is square of 5
so the difference between 3 and 5 is 2
so the difference between 4 and 3 is greater then 5 by 2 it means 7
and the difference between 3 and 4 =square of 7 that is 49 so third no =87
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