a man has four socks in his drawer . each socket is either black or white . the changes of him selecting a pair at random and finding that he has a white pair is 0.5. what one his chances of the pair being black?

Question

anonymous · Answer

option are ;a.0  b.0.5 c.2/3 d.none.

anonymous · Answer

answer is none.  he has 4 socks in the drawer.  the number of ways to pick two out of 4 is $$\dbinom{4}{2}=6$$ and this is your denominator.  you numerator therefore must be 3 which is $$\dbinom{3}{1}$$ so he hasd 3 white socks to pick from

anonymous · Answer

if this is abstract, draw 4 circles, 3 open and once shaded in. then see what all the combinations are and you will see that half of them have two white socks and half have one white and one black.

anonymous · Answer

oops 0 is the answer. the probability is 0, not 'none'

anonymous · Answer

great job,

anonymous · Answer

thnx

anonymous · Answer

try next question.

anonymous · Answer

if you write down my age followed by my age when i was ayear younger, you get a four digit number. taking the square root of that number gives my house number. what is my house number.?

anonymous · Answer

is this a quiz?

anonymous · Answer

you are old. 
91

anonymous · Answer

no its 71 but i could find the reason.