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There are a number of red beads and white beads in a jar. If Mike were

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Math Expert
Joined: 02 Sep 2009
Posts: 47016
There are a number of red beads and white beads in a jar. If Mike were [#permalink]

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07 Apr 2016, 08:36
1
5
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Difficulty:

55% (hard)

Question Stats:

55% (01:09) correct 45% (00:55) wrong based on 87 sessions

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There are a number of red beads and white beads in a jar. If Mike were to simultaneously pick two beads from the jar, what is the probability that he will not pick any red beads?

(1) The probability of selecting two red beads is 8/45.
(2) The probability of selecting two white beads is 1/45.

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Math Expert
Joined: 02 Aug 2009
Posts: 6206
Re: There are a number of red beads and white beads in a jar. If Mike were [#permalink]

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07 Apr 2016, 08:47
1
Bunuel wrote:
There are a number of red beads and white beads in a jar. If Mike were to simultaneously pick two beads from the jar, what is the probability that he will not pick any red beads?

(1) The probability of selecting two red beads is 8/45.
(2) The probability of selecting two white beads is 1/45.

Hi,
before we solve lets see what are the types of prob when two items are involved
1) both red
2) both white
3) one white one red

what does "probability that he will not pick any red beads" MEANS..

ONLY the second case " both white"

lets see the statements

(1) The probability of selecting two red beads is 8/45.
we know prob of 1, and of rest two combined but NOT both white
Insuff

(2) The probability of selecting two white beads is 1/45.
This is the second case we are looking for
Suff

B
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

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Joined: 02 Apr 2014
Posts: 486
GMAT 1: 700 Q50 V34
Re: There are a number of red beads and white beads in a jar. If Mike were [#permalink]

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22 Nov 2017, 15:05
1
Hi chetan2u Bunuel

I have one question, question stem says, there are a number of red and white beads, does it mean that there are certain number of red and white beads and there could be other color beads also?

Thanks
Re: There are a number of red beads and white beads in a jar. If Mike were   [#permalink] 22 Nov 2017, 15:05
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