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It must 4/7*5/9*1/2+4/7*4/9*1/2+3/7*5/9*1/2 = 51/126 . Must not it?
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Chief Hopper
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It must 4/7*5/9*1/2+4/7*4/9*1/2+3/7*5/9*1/2 = 51/126 . Must not it?