A problem by Pankaj Joshi
If 3 0 ! = 2 x 1 ∗ 3 x 2 ∗ 5 x 3 ∗ 7 x 4 ∗ 1 1 x 5 ∗ 1 3 x 6 ∗ 1 7 x 7 ∗ 1 9 x 8 ∗ 2 3 x 9 ∗ 2 9 x 1 0 , then ∑ i = 1 1 0 x i is equal to
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