(1-1/4)X(1-1/9)X(1-1/16).(1-1/49)

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(1-1/4)X(1-1/9)X(1-1/16).(1-1/49)(1-1/4)X(1-1/9)X(1-1/16).(1-1/49)(1-1/4)X(1-1/9)X(1-1/16).(1-1/49)可

(1-1/4)X(1-1/9)X(1-1/16).(1-1/49)
(1-1/4)X(1-1/9)X(1-1/16).(1-1/49)

(1-1/4)X(1-1/9)X(1-1/16).(1-1/49)
可以直接算
(1-1/4)(1-1/9)(1-1/16)(1-1/25)(1-1/36)(1-1/49)=(3/4)x(8/9)x(15/16)x(24/25)x(35/36)x(48/49)然后可以两两相乘得 (2/3)X(9/10)X(20/21)得4/7

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