prove 7 factorial × 6 factorial is 10 factorial
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10!=10*9*8*7...1
=10*9*8*7!
=7!*(720)
since we know that 6!=720
we can replace 720 by 6!
therefore
10!=7!*6!
hence proved
=10*9*8*7!
=7!*(720)
since we know that 6!=720
we can replace 720 by 6!
therefore
10!=7!*6!
hence proved
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