If a, b, c, d, e and f are in GP, then the value of depends on :
x and y
x and z
y and z
independent of x, y and z
The length of the longest size rectangle of maximum area that can be inscribed in a semicircle of radius 1, so that 2 vertices lie on the diameter, is :
2
The sum of the series is equal to :
B.
Given series can be rewritten as