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    r the placement nd train purpose


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    r=4

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    6!÷(n-r)!)÷(6!÷(r!)(n-r)!=360÷15 =r!=24 ans-4

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    6!/(6-r)!=24×6!/r!×(6-r)!
    Simplifying we get r=4

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    r!=24 then r=4.

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    nPr = nCr×r!
    6Pr = 15 *r!
    360 =15 *r!
    r! =360 /15 =24
    r! = 4*3*2*1
    => r! =4!
    Therefore, r = 4.

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  7. Renuka

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    n!/(n-r)!=360 n!/ r!(n-r)!=15

    r!=24
    =4.3.2.1

    So ans= 4.

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