Problem Solving

Wishing every one a happy new year 2009. While drinking alchohol, here is an easy problem to solve...

A store buys 10 bottles of alcohol, including 7 bottles of whiskeys. In the evening, 6 bottles of alcohol are sold one by one, and the rest is consumed by the personnel. What is the probability of selling 4 whiskeys among the 6 bottles? Assume that every bottle has an equal chance of being bought.

A. 2/5
B. 3/5
C. 2/3
D. 1/2
E. 4/7

[spoiler]OA: D[/spoiler]

PS: If this problem dint look easy, then u havent drunk enough

vittalgmat wrote:Wishing every one a happy new year 2009. While drinking alchohol, here is an easy problem to solve...

A store buys 10 bottles of alcohol, including 7 bottles of whiskeys. In the evening, 6 bottles of alcohol are sold one by one, and the rest is consumed by the personnel. What is the probability of selling 4 whiskeys among the 6 bottles? Assume that every bottle has an equal chance of being bought.

A. 2/5
B. 3/5
C. 2/3
D. 1/2
E. 4/7

[spoiler]OA: D[/spoiler]

PS: If this problem dint look easy, then u havent drunk enough

7C4( 4 whiskey bottles)* 3C2( other bottles)/10C6

105/210 = 1/2

hope that helps...

Happy New Yr to All !!!!