OA after some discussion
Target Test Prep is 20% off right now!
Use code FLASH20
Available with Beat the GMAT members only code
MORE DETAILS
700+ Veritas Quant
This topic has expert replies
-
chaitanya.mehrotra
- Master | Next Rank: 500 Posts
- Posts: 184
- Joined: Thu Nov 25, 2010 9:57 pm
- Thanked: 1 times
- Followed by:5 members
- GMAT Score:700
You know, you can post the OA using spoiler tags. There's no need to 'post it after discussion'.
My answer is D.
We just need to know that the next three rolls have to be the same number, but different from the pair. The probability is P(a number different from the 'pair') x P(same as previous roll) x P(same as previous roll). This is 5/6 x 1/6 x 1/6 = 5/216.
My answer is D.
We just need to know that the next three rolls have to be the same number, but different from the pair. The probability is P(a number different from the 'pair') x P(same as previous roll) x P(same as previous roll). This is 5/6 x 1/6 x 1/6 = 5/216.
-
krishnasty
- Master | Next Rank: 500 Posts
- Posts: 142
- Joined: Mon Jan 10, 2011 8:03 am
- Thanked: 19 times
IMO D
The first 2 dices have already been rolled out with a number.
the third dice should not have the previous number = (1-1/6) = 5/6
the next 2 rolls have to have the number which was rolled out at the third dice = (1/6) * (1/6)
total probablity = (5/6) * (1/6) * (1/6) = 5/216
The first 2 dices have already been rolled out with a number.
the third dice should not have the previous number = (1-1/6) = 5/6
the next 2 rolls have to have the number which was rolled out at the third dice = (1/6) * (1/6)
total probablity = (5/6) * (1/6) * (1/6) = 5/216
---------------------------------------
Appreciation in thanks please!!
Appreciation in thanks please!!
