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    Help with Factorial Questions

    1) Show that k(k!) = (k+1)!-k! 2) Find the largest power of 7 that is a divisor of 100! 3) Express using factorial notation: a) 30 x 28 x 26 x...x 4 x 2 b) 29 x 27 x 25 x...x 3 x 1 Thanks!
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