👤

1+3+5+7+.......+99= Cat face?

Răspuns :

1 + 3 + ... 2n - 1 = n^2

2n - 1 = 99

2n = 100

n = 50

1 + 3 + .. + 99 = 50 ^2 = 2500

1+3+5+7+...+99 = (99+1)x50/2 = 50x50 = 2500