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If .^(n+r)P(2)=110and .^(n-r)P(2)=20, f...

If `.^(n+r)P_(2)=110and .^(n-r)P_(2)=20`, find n and r.

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Knowledge Check

  • If .^(n)P_(r)=x.^(n)C_(r) x=

    A
    `.^(n)P_(r-1)`
    B
    `.^(n)C_(r-1)`
    C
    `n!`
    D
    `r!`

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    Explore conceptually related problems

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    If .^(2n+1)P_(n-1): .^(2n-1)P_(n)=3:5 , find n.

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