Question

Find the 25th term of AP =-5,-5/2,0,5/2?

Answer 1

a = -5
d = -5/2 - (-5) = 5/2
25th term = a + (n-1)d
= -5 + (24) 5/2
= -5 + 60
= 55

Answer 2

Given A.P -5, -5/2, 0, 5/2
Here first term(a) = - 5
common difference(d) = 5/2

25th term = a + 24d = - 5 + 24(5/2) = 55