1.

A2=x-y and a5=x+y then the first term of that A.P

Answer»

               a2 = X - y

 Thus, a + d = x - y ........(1)

      Also, A5 = x + y

Thus, a + 4d = x + y ........(2)

(2) - (1), we GET

               3D = 2y

                 d = 2y/3

Substituting 'd' in (1), we get

      a + 2y/3 = x -y

              a = x - 5y/3


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