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mgmatps2

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by stop@800 » Mon Oct 20, 2008 3:34 am
is OA 12/35 ??

explanation after OA :)
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by cramya » Mon Oct 20, 2008 5:35 am
I see 2 choices left out. I am getting 9/25. Whats the OA?
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Re: mgmatps2

by sudhir3127 » Mon Oct 20, 2008 7:15 am
stubbornp wrote:please explain
i am not happy with the way MGMAT has drafted this question... it wouldbe gr8 if stacey can help us understand it the way Mgmat wants it to be conveyed.. for me there are 2 answers...

one :

Probability of a non-nickel on first pick = (5 pennies + 4 dimes) / 15 coins = 3/5

Probability of a non-nickel on second pick = (8 non-nickel coins) / 14 coins = 4/7

thus its 3/5*4/7 = 12/35

second:

if this the Question is asking the probability of picking any combination other than NN.

Prob of NN = 6/15 * 5/14 = 1/7
Prob of not NN = 1- 1/7 = 6/7
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Re: mgmatps2

by stubbornp » Mon Oct 20, 2008 9:59 pm
sudhir3127 wrote:
stubbornp wrote:please explain
i am not happy with the way MGMAT has drafted this question... it wouldbe gr8 if stacey can help us understand it the way Mgmat wants it to be conveyed.. for me there are 2 answers...

one :

Probability of a non-nickel on first pick = (5 pennies + 4 dimes) / 15 coins = 3/5

Probability of a non-nickel on second pick = (8 non-nickel coins) / 14 coins = 4/7

thus its 3/5*4/7 = 12/35

second:

if this the Question is asking the probability of picking any combination other than NN.

Prob of NN = 6/15 * 5/14 = 1/7
Prob of not NN = 1- 1/7 = 6/7

Exactly sudhir,I am confused due to same reason.....
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