If 1960 = 2 a .5 b .7 c , calculate the value of 2 -a .7 b .5 -c .

Factorizing 1960, we get : ⇒ 1960 = 2 3 .5 1 .7 2 ⇒ 2 a .5 b .7 c = 2 3 .5 1 .7 2 ⇒ a = 3, b = 1 and c = 2. Substituting values of a, b and c in 2 -a .7 b .5 -c , we get : Hence, 2 -a .7 b .5 -c = .