Question

the first four terms of an ap whose first is 3 x+y and common difference is x-y are

Answer 1

a₁ = 3 x+y

d = x-y

a₂=a+d = 3 x+y +x- y

= 4 x

a₃=a+2 d=3x+y+2(x-y) = 3x+y+2x_2y = 5x-y

a₄ = a+3d = 3x+y+3(x-y)=3x+y+3x-3y = 6x - 2y

the first four terms are 3x+y, 4x , 5x - y, 6x-2y