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1 - (3/25·6/25 + 3/25·9/25 + 7/25·10/25 + 7/25·9/25 + 15/25·10/25 + 15/25·6/25) =
1 - (3/25·6/25 + 3/25·9/25 + 7/25·10/25 + 7/25·9/25 + 15/25·10/25 + 15/25·6/25) =
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