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Seven cards, each of a different color are shuffled and placed in a ro

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Carcass
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Seven cards, each of a different color are shuffled and placed in a ro [#permalink] New post   24 May 2021, 03:52
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Seven cards, each of a different color are shuffled and placed in a row. What is the probability that the blue card is placed at an end? Express your answer as a fraction.

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2/7
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Re: Seven cards, each of a different color are shuffled and placed in a ro [#permalink] New post   11 Nov 2021, 12:17
Carcass wrote:
Seven cards, each of a different color are shuffled and placed in a row. What is the probability that the blue card is placed at an end? Express your answer as a fraction.

Show: :: OA
2/7


There are 7 cards, P(blue card is first in the row) = 1/7, and P(blue card is last in the row) = 1/7.

So, P(blue card is the first OR the last in the row) = P(blue card is first in the row) + P(blue card is last in the row)
= 1/7 + 1/7
= 2/7

Answer: 2/7
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Re: Seven cards, each of a different color are shuffled and placed in a ro [#permalink] New post   24 May 2021, 23:54
solution plz
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Re: Seven cards, each of a different color are shuffled and placed in a ro [#permalink] New post   25 May 2021, 07:26
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void wrote:
solution plz


The solution is 2/7 because there are only 7 cards, so there are only 7 places in the row where the blue card could be placed. The question asks what the probability is of the blue card being placed on "an" end, meaning either the beginning or the end of the row. So, since there are 7 spots available and it can be placed on either end, that leaves a possible chance of 2/7 for the blue card to be placed on an end of the row.
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