Question

If 7.2 ,a,b,3 are in Ap find a,b

Answer 1

given,it's an AP
so, 7.2+3d = 3
     3d = -4.2
     hence, d = -1.4
thus, a = 7.2 + (-1.4) = 5.8
         b = 5.8 + (-1.4) = 4.4