Ta có 1-1/2 =1/2
1-1/3=2/3
1-1/4=3/4
.......
1- 1/100=99/100
=> P= 1/2x2/3x3/4x....x99/100
= ( 1x2x3x...x 99)/ (2x3x4x...x100)
=1/1000
Nguyen thi lan huong sai roi phai bang1/100 moi dung
( 1 - 1/2 ) x ( 1 - 1/2 ) x ... x ( 1-100 )
1 - 1/3 = 2/3
1 - 1/4 = 3/4
.........
1 - 1/100 = 99/100
=> = 1/2 x 2/3 x 3/4 x ... x99/100
=> = ( 1 x 2 x 3 x ..x 99 ) / ( 2 x 3 x 4 x .. x 100 )
=> = 1/100