Question 1145049
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(a)  wPw-2  is the standard designation for the number of <U>PERMUTATIONS</U>.


     The only way to interpret  wPw-2, which  I know, is  wP(w-2), which is


         wP(w-2) = w*(w-1)*(w-2)* . . . *3   (in all, there are (w-2) factors in the product).


     To calculate it, the <U>value</U> of w must be given.


     For example,  at w= 5  wP(w-2) is  5P3 = 5*4*3 = 60.




(b)  wCw-2  is the standard designation for the number of <U>COMBINATIONS</U>.


     The only way to interpret  wCw-2,  which I know, is  wC(w-2), which is


         wP(w-2) = {{{w!/((w-2)!*2!)}}}


     To calculate it, the <U>value</U> of w must be given.


     For example,  at  w= 5,  wC(w-2) is  {{{5!/(3!*2!)}}} = {{{(5*4)/(1*2)}}} = {{{20/2}}} = 10.
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Generally speaking, &nbsp;it is very strict and unexpected move from your side &nbsp;(if to use the &nbsp;"chess" &nbsp;language) - 
- to come to the forum and to ask about something, you don't know about what.


It is not the way and not the level to discuss something &nbsp;"on substance".