Plz solve the first part of 9th question and solve the 11th question
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Step-by-step explanation:
RHS = n(n-1)!/(r-1)!(n-r)!
= n!/(r-1)!(n-r)!
LHS = r*n!/r!(n-r)!
= n!/(r-1)!(n-r)!
= RHS
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