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(1 +1 / 2) * (1-1/2) * (1 +1 / 3) * (1-1/3 )*...*( 1 +1 / 9) * (1-1/9 )

Heibang o Anne2010-03-29 19:10:02 +0000 #1
such as the title ah! ! !

I forgot the method
happyforever562010-03-29 19:14:20 +0000 #2
divided into two groups:

(1 +1 / 2) * (1 +1 / 3 )*...*( 1 +1 / 9) = 3 / 2 * 4 / 3 *...* 10 / 9 = 10 / 2 = 5

(1-1/2) * (1-1/3 )*...*( 1-1/9) = 1 / 2 * 2 / 3 *...* 8 / 9 = 1 / 9

of the original type = 5 / 9

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