Question

If f(x) is twice differentiable and continuous function in x ∈ [a,b] also f'(x) > 0 and f ''(x) < 0 and c ∈ (a,b) then (f(c) - f(a))/(f(b) - f(c)) )a(f is greater than

(1) (b - c)/(c - a)

(2) 1

(3) (a + b)/(b - c)

(4) (c - a)/(b - c)

Answer 1

Answer is (4) (c - a)/(b - c)