Đáp án:
101/200
Giải thích các bước giải:
P = 3/4 x 8/9 x 15/16 x ... x 9999/10000
P = $\frac{1x3}{2x2}x$ $\frac{2x4}{3x3}x$ $\frac{3x5}{4x4}x...x$ $\frac{99x101}{100x100}$
P = $\frac{(1x2x3x...x99)x((3x4x5x...x101)}{(2x3x4x...x100)x(2x3x4x...x100)}$
P = $\frac{1x101}{100x2}=$ $\frac{101}{200}$