Question

7*5pr=7pr-1 then find r​

Answer 1

Answer:

Consider the given equation.

Consider the given equation.5Pr=6Pr−1

Consider the given equation.5Pr=6Pr−1(5−r)!r!5!=(6−r+1)!(r−1)!6!

Consider the given equation.5Pr=6Pr−1(5−r)!r!5!=(6−r+1)!(r−1)!6!(5−r)!r(r−1)!5!=(5−r)!(r−1)!6!

Consider the given equation.5Pr=6Pr−1(5−r)!r!5!=(6−r+1)!(r−1)!6!(5−r)!r(r−1)!5!=(5−r)!(r−1)!6!r5!=16!

Consider the given equation.5Pr=6Pr−1(5−r)!r!5!=(6−r+1)!(r−1)!6!(5−r)!r(r−1)!5!=(5−r)!(r−1)!6!r5!=16!r=6!5!=61