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1a. Proof by induction: For every positive integer n, 1•3•5...(2n-1)=(2n)!/(2n•n!). Please explain what the exclamation mark means. Thank...

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Advance Math

1a. Proof by induction: For every positive integern,
1•3•5...(2n-1)=(2n)!/(2n•n!). Please explain what the exclamationmark means. Thank you for your help!

1b. Proof by induction: For each integer n>=8,there are nonnegative integers a and b such that n=3a+5b

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