Factorial & Binomial Coefficient

1. Define n! factorial and binomial coefficient:

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2.Simplify:

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3.Solve in positive integers:

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4.Solve in positive integers:

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5.Solve in integers:

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6.Which number is greater?

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7.Solve in positive integers:

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8.Solve in positive integers:

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9.Solve the set of equations in positive integers and non-negative integers:

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10.For which positive integer x stands:

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