Can you explain more on how to get 255 ways to select a pair?
Thank you.
Alex
--- In Math4u@yahoogroups.com, "w7anf" <cherry@...> wrote:
>
> 495 ways to select 4 cards from 12.
> 255 ways to select a pair.
> 255/495=17/33
> None of the answers are correct.
> Jim FitzSimons
>
> --- In Math4u@yahoogroups.com, "Alex Chandra" <mbs@> wrote:
> >
> > Bill has a small deck of 12 playing cards made up of only 2 suits
> of 6
> > cards each. Each of the 6 cards within a suit has a different
> value
> > from 1 to 6; thus, there are 2 cards in the deck that have the
> same value.
> >
> > Bill likes to play a game in which he shuffles the deck, turns
> over 4
> > cards, and looks for pairs of cards that have the same value. What
> is
> > the chance that Bill finds at least one pair of cards that have the
> > same value?
> >
> > a. 8/33
> > b. 62/165
> > c. 14/33
> > d. 103/165
> > e. 25/33
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