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Find the number of solutions to
x_1 + x_2 + x_3 + x_4 + x_5 + x_6 + x_7 \le 10
in nonnegative integers, where x_2 is even and x_5 is odd.

 May 30, 2024
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The number of solutions is 3218.

 May 31, 2024

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