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How many solutions are there to the equation
x1 + x2 + x3 + x4 + x5 + x6 = 29,
where xi , i = 1, 2, 3, 4, 5, 6, is a nonnegative integer such
that
a) x1 ≤ 5?
b) x1 < 8 and x2 > 8?

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manual sol, can u verify this.

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