manhattan word problems, book 5,chap-7 , problem - 6

[anik1989]

john invites 12 friends to dinner party, half of which are men. exactly one man and one woman are bringing desserts. if one person this group is selected randomly, what is the probability that it is a woman or a man who is not bringing a dessert?

[tommywallach]

Hey Anik,

Well, let's count it out.

6 men
6 women
12 people altogether

1 man with dessert
1 woman with dessert
10 people with no desserts

That's 12 people altogether, and 10 people without dessert. So the answer is 10/12 = 5/6.

-t

[anik1989]

yes, this the ans i thought but this book brought an ans that is 11/12. would you please check the ans in this book of 2nd edition. so which is the correct one. 11/12 or 5/6

[tommywallach]

2nd edition? That's years old! I'd assume it's a typo in that old edition. Sorry! : )

-t