Prove that 
.
To Prove :
Formula : n! = n × (n - 1)!
= 
= 
= R.H.S.
∴L.H.S. = R.H.S.
Conclusion : 
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Couldn't generate an explanation.
Generated by AI. May contain inaccuracies — always verify with your textbook.
8. Permutations
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