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A box contains only red chips, green chips and blue chips. If a chip i

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A box contains only red chips, green chips and blue chips. If a chip i [#permalink]

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New post 27 Aug 2017, 19:51
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A box contains only red chips, green chips and blue chips. If a chip is randomly selected from the box, what is the probability that the chip is either red or green?

A. The probability of selecting green chip is 1/3

B. The Probability of selecting a blue chip is 1/7
[Reveal] Spoiler: OA

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Re: A box contains only red chips, green chips and blue chips. If a chip i [#permalink]

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New post 27 Aug 2017, 20:26
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fitzpratik wrote:
A box contains only red chips, green chips and blue chips. If a chip is randomly selected from the box, what is the probability that the chip is either red or green?

A. The probability of selecting green chip is 1/3

B. The Probability of selecting a blue chip is 1/7


hi..

I am sure these type of Qs would have been discussed in various ways in the forum..

in such Qs main point is to remember: - 3 things probability that it is 3rd item is equal to probability it is not the FIRST two AND vice-versa..


either red or green..
1) we require to know each of red and green
2) OR we require to know about blue


A. The probability of selecting green chip is 1/3
we require to know red too..
insuff

B. The Probability of selecting a blue chip is 1/7
sufficient ans 1-1/7=6/7

B
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Re: A box contains only red chips, green chips and blue chips. If a chip i [#permalink]

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New post 28 Aug 2017, 02:14
chetan2u wrote:
fitzpratik wrote:
A box contains only red chips, green chips and blue chips. If a chip is randomly selected from the box, what is the probability that the chip is either red or green?

A. The probability of selecting green chip is 1/3

B. The Probability of selecting a blue chip is 1/7


hi..

I am sure these type of Qs would have been discussed in various ways in the forum..

in such Qs main point is to remember: - 3 things probability that it is 3rd item is equal to probability it is not the FIRST two AND vice-versa..


either red or green..
1) we require to know each of red and green
2) OR we require to know about blue


A. The probability of selecting green chip is 1/3
we require to know red too..
insuff

B. The Probability of selecting a blue chip is 1/7
sufficient ans 1-1/7=6/7

B


Yes, this is a copy of the following OG question: https://gmatclub.com/forum/a-box-contai ... 44131.html

Similar question from Magoosh: https://gmatclub.com/forum/a-box-contai ... 95322.html
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Re: A box contains only red chips, green chips and blue chips. If a chip i [#permalink]

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New post 28 Aug 2017, 02:44
Ans is B
see the pic for solution.
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Re: A box contains only red chips, green chips and blue chips. If a chip i [#permalink]

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New post 28 Aug 2017, 20:02
good question, i fall into a little trap
i thought we need to get the % of red
but actually we just need to subtract the blue portion then we can get green and red

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Re: A box contains only red chips, green chips and blue chips. If a chip i [#permalink]

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New post 28 Aug 2017, 23:01
pclawong wrote:
good question, i fall into a little trap
i thought we need to get the % of red
but actually we just need to subtract the blue portion then we can get green and red


Always stick to fundamentals and go by procedure and you will never go wrong. I hope your doubt is clear.
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Re: A box contains only red chips, green chips and blue chips. If a chip i   [#permalink] 28 Aug 2017, 23:01
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