Question

find the 25 terms of the a.p. 100,96,92,88....

Answer 1

a = 100
d = T₂ - T₁
   = 96- 100 
   = - 4

n = 25
therefore ,
T₂₅ = a + ( n - 1 ) d
      = 100 + ( 25 - 1 ) - 4
      = 100 + ( 24 ) - 4 
      = 100 - 96 
      = 4 

Answer 2

25th term = a + 24d
= 100 + 24x-4
= 100 - 96
= 4 ans.