nazii wrote:
I was thinking should we concsider different case of probability of getting for example all 3 blue marbles from cup B?
in that way the answer would be different !
your response considered the case where one marble is picked from each cup, but I didn't such explicitly from question stem. How we should find it out?
Dear
Sajjad1994what is official explanation. How we can resolve this ambiguity?
Apt0810 wrote:
Probability of 3 blue=
Picking blue from each cup
So probability of blue in Cup A = 2/8
probability of blue in Cup B= 6/10
probability of blue in Cup C= 6/10
So Probability of 3 blue= 2/8 * 6/10 *6/10 = 9/100= 0.090
Similarly
Probability of 3 Red=
Picking blue from each cup
So probability of Red in Cup A = 6/8
probability of Red in Cup B= 4/10
probability of Red in Cup C= 4/10
So Probability of 3 Red= 6/8 * 4/10 *4/10 = 0.12
Posted from my mobile device
1. Keep things simple and limited to the extent required by the question.
2. Do not overthink; it will spoil all of your conceptual work.
3. This question belongs to GMAT prep, so any ambiguity is near to impossible.
Quote:
I was thinking should we concsider different case of probability of getting for example all 3 blue marbles from cup B?
in that way the answer would be different !
your response considered the case where one marble is picked from each cup, but I didn't express this explicitly from the question stem. How should we find it out?
Why do we need to do that? when the question is specifically not asking to do that.
Dmitry will randomly pick three marbles, one from each cup.Rule 4: Do not assume things; read the question carefully and stick to it.
Thank you