If x, y, z, w are positive real numbers such that x, y, z, w form an increasing A.P. and x, y, w form an increasing G.P. then w/x =?
(a) 1
(b) 2
(c) 3
(d) 4
Correct option (d) 4
Explanation:
If y = x + d, z = x + 2d, w = x + 3d then (x + d)2 = x(x + 3d) or d = x w/x = 4x/x = 4.
