Question

ЧЕМУ РАВНА СУММА
1/1*3 + 1/3*5+.....+1/99*101


А) 1/101
B)2/101
C) 5/101
D)50/101

Answer 1

1*3;3*5;5*7;7*9;9*11   (5)
11*13.....................
21...............
31..............
41...........
(10)⇒
(5*10)/101=50/101