Question

A.P. 3,8,13,18,.... ka konsa pad 78 hai

Answer 1

an = a + (n -1 ) d
78 = 3 + ( n - 1) 5
78-3 = ( n-1) 5
75/5 = (n - 1 )
15 + 1 = n
n = 16

Answer 2

Here is ur ans!!...Hope It helps u!!