Stumped on Probability!

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GMatt08: Newbie | Next Rank: 10 Posts; Posts: 5; Joined: Wed Mar 05, 2008 9:59 am; Location: Arlington, VA

by GMatt08 » Wed Mar 12, 2008 7:37 am

I took alllll sorts of math classes throughout highschool and college but never Stats and Probability! Could someone walk me through this a bit?

Greatly appreciated!

-Matt

Melinda’s lights went out. She has 3 pairs of red socks in her drawer, 2 pairs of black socks, and 5 pairs of white socks. What is the minimum number of pairs she must remove from the drawer to ensure that she has a pair of each color?

A 3
B 5
C 7
D 9
E 10

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Source: Beat The GMAT — Problem Solving | Wed Mar 12, 2008 7:37 am

ikant: Senior | Next Rank: 100 Posts; Posts: 62; Joined: Wed Mar 05, 2008 8:57 am; Location: mumbai, India; Thanked: 5 times

by ikant » Wed Mar 12, 2008 9:59 am

Ok this is a logical problem.

Since you need to find the minimum number of pairs you must consider the worst case.

We have 3p - red socks, 5p - white and 2p - black.

Worst case would make one pick all white and all red and then one black.

So the number = 5+3+1 =9.

ans is d.

"To do is to be"

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sampleresume: Senior | Next Rank: 100 Posts; Posts: 55; Joined: Sun Apr 06, 2008 5:04 pm

by sampleresume » Wed Apr 16, 2008 6:49 am

Take a look at the GMAT Math Review by GMAC. It has a complete introdution of Stats or Probablity

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