Question

if ap is 65 60 55 50 then find a and d?

Answer 1

a = first term of the A.P 
Therefore, a = 65

d = a(n+1) - a(n)
d = 60 - 65 = -5 

Hope it helps u ...^_^

Answer 2

A.P--> 65 , 60, 55, 50...
a = first term = 65
d = a2- a1 = 60-65 = (-5)