Question 1178388
{{{P(n,2) = 380 *a}}}

{{{P(n,2)=(n!)/((n - 2)!)=(n - 1) n}}}

{{{(n - 1) n= 380 *a}}}

{{{a=(n - 1) n/380}}}

{{{P(n,2) = 380 *(n - 1)n/380}}}



{{{10P5 = (n - 4) (n - 3) (n - 2) (n - 1) n=(10 - 4) (10 - 3) (10 - 2) (10 - 1) 10=6*7*8*9*10}}}


{{{8Pr = 20160*a }}}

{{{8!/(8 - r)!= 20160*a }}}

{{{a=(8!/(8 - r)!)/20160}}}

{{{a=(20160*8!)/(8 - r)!}}}

{{{8Pr = 20160*(8!/(20160*(8 - r)!) )}}}



{{{P(6,6) = 6!/(6 - 6)!=6!/0!= 6*5*4*3*2*1}}}


{{{7Pr = 840 *a}}}

{{{7!/(7 - r)!=840 *a}}}

{{{a=(7!/840(7 - r)!)}}}

{{{7Pr = 840 *(7!/(840(7 - r)!))}}}


{{{nP3 = 60 *a}}}
{{{(n!/((n - 3)!))= 60 *a}}}
{{{a=(n!/(60(n - 3)!))}}}
{{{nP3 = 60 *(n!/(60(n - 3)!))}}}


{{{12P3 = (12!)/((12 - 3)!)=(12!)/(9!)=12*11*10}}}


{{{nP4 = 7920 *a}}}

{{{n!/(n - 4)! = 7920 *a}}}

{{{a=(n!/(7920(n - 4)!)) }}}

{{{nP4 = 7920 *(n!/(7920(n - 4)!))}}}