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sum of ((-1)^(i+1) * binom (10,i)) / (1 - binom (28-i,5) / binom (28,5)) for i=1..10
sum of ((-1)^(i+1) * binom (10,i)) / (1 - binom (28-i,5) / binom (28,5)) for i=1..10
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