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If a,b,c are the values of n where ...

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

Text Solution

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The correct Answer is:
C
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If ""^(n)P_(7)=42. ""^(n)P_(5). find n.

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

Knowledge Check

  • If ""^(n)P_(4):""^(n)P_(3)=2:1 then is

    A
    5
    B
    8
    C
    7
    D
    6

  • If ""^(n)P_(5)=""^(n)P_(6) then n is

    A
    15
    B
    7
    C
    6
    D
    10

    • Similar Questions

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    Find the value of n such that ""^(n)P_(5)=42""^(n)P_(3), n gt 4

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

    If ""^((n+1))P_(5): ""^(n)P_(6)=2:7 , find

    If ""^(n)P_(3)=1320 , find n.

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

    Find n if ""^(n-1)P_(3) : ""^(n)P_(4)=1:9 .

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