T h e s u m ∑ r = 1 n r C r 2 n i s e q u a l t o ( A ) n . 2 2 n - 1 ( B ) 2 2 n - 1 ( C ) 2 n - 1 + 1 ( D ) N o n e o f t h e s e Share with your friends Share 0 Rambaboo Khatana answered this 0 View Full Answer