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If ""^(n)P(4)=1680, find n....

If `""^(n)P_(4)=1680,` find n.

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If ""^(n)P_(4)=210 , find n.

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Knowledge Check

  • If a,b,c are the values of n where ""^(n)P _(7) = 42 ""^(n)P_(5) ,""^(n)P_(4) = 1680 , ""^(n) P_(3) =1320 respectively then the ascending order of a,b,c is

    A
    a,b,c
    B
    b,c=a
    C
    c=b,a
    D
    c,a,b

  • If ""^(n)P_(r)=3024 then (n,r) is

    A
    (4,9)
    B
    (9,4)
    C
    (9,6)
    D
    (6,9)

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