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If .^(15)P(r)=2730 , then the value of r...

If `.^(15)P_(r)=2730` , then the value of r will be -

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If "^10 P_r=5040 , find the value of r .

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Knowledge Check

  • If .^(15)C_(r)=^(15)C_(r+1) then the value ofr is -

    A
    6
    B
    7
    C
    4
    D
    3

  • If 16C_r=^16C_(2r+1) then the value of r will be

    A
    6
    B
    5
    C
    4
    D
    3

    • Similar Questions

    Explore conceptually related problems

    Let P = sum_(r=1)^(50) (""^(50+r)C_(r)(2r-1))/(""^(50)C_(r)(50+r)), Q = sum_(r=1)^(50) (""^(50)C_(r))^(2) , Then find the value of P - Q

    If .^(n)P_(r)=120xx.^(n)C_(n-r) , find the valueof r.

    If .^15 C_(3r):^(15)C_(r+1)=11 :3 , find the value of rdot

    If .^(n+r+1)P_(2)=72and.^(n-r)P_(2)=12 then find the values of n and r.

    If "^9P_5+5*^9P_4=^(10)P_r , find the value of r .

    If ""^(16)C_(r)=""^(16)C_(r+1) then the value of ""^(r)P_(r-3) is

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