Math, asked by sabareesh20042005, 7 months ago

if np5=60n-1p3 then n it's ​

Answers

Answered by MaheswariS
4

\underline{\textsf{Given:}}

\mathsf{^nP_5=60\,(^{(n-1)}P_3)}

\underline{\textsf{To find:}}

\textsf{The value of n}

\underline{\textsf{Solution:}}

\underline{\mathsf{Formula\;used:}}

\mathsf{^nP_r=n{\times}(n-1){\times}(n-2)........\;r\;factors}

\mathsf{Consider,}

\mathsf{^nP_5=60\,(^{(n-1)}P_3)}

\implies\mathsf{n{\times}(n-1){\times}(n-2){\times}(n-3){\times}(n-4)=60{\times}(n-1){\times}(n-2){\times}(n-3)}

\implies\mathsf{n(n-4)=60}

\implies\mathsf{n^2-4n-60=0}

\implies\mathsf{(n-10)(n+6)=0}

\implies\mathsf{n=10,-6}

\mathsf{But\;n\,cannot\;be\;negative}

\therefore\textsf{The suitable value of n is 10}

\underline{\textsf{Find more:}}

If np3 =n-1p4 then n​

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