10. I f △ r = 2 r - 1 2 . 3 r - 1 4 . 5 r - 1 x y z 2 n - 1 3 n - 1 5 n - 1 , p r o v e t h a t ∑ r = 1 n △ r = 0 . 11. I f △ r = r - 1 n 6 r - 1 2 2 n 2 4 n - 2 r - 1 3 3 n 3 3 n 3 - 3 n , p r o v e t h a t ∑ r = 1 n △ r = 0 . Share with your friends Share 0 Adarsh Saini answered this xxc 2 View Full Answer
