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Jake remembers only the last three letters of his four-letter Klingon

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Jake remembers only the last three letters of his four-letter Klingon [#permalink]

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Jake remembers only the last three letters of his four-letter Klingon name. If he is sure that the first letter is neither "N" nor "Z", and assuming that there are only 10 letters in the Klingon alphabet, what is the probability that he will give the correct name when asked for it by the space attendant?

A. 8/100
B. 9/100
C. 1/8
D. 4/5
E. 9/10
[Reveal] Spoiler: OA

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Re: Jake remembers only the last three letters of his four-letter Klingon [#permalink]

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New post 20 Sep 2016, 08:41
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Bunuel wrote:
Jake remembers only the last three letters of his four-letter Klingon name. If he is sure that the first letter is neither "N" nor "Z", and assuming that there are only 10 letters in the Klingon alphabet, what is the probability that he will give the correct name when asked for it by the space attendant?

A. 8/100
B. 9/100
C. 1/8
D. 4/5
E. 9/10


Total letters 10, out of which the first letter is anything of 10 but N or X...
So there are 8 possible letters for first place..
And only one of them is correct..
So 1/8.. C
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Re: Jake remembers only the last three letters of his four-letter Klingon [#permalink]

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New post 20 Sep 2016, 11:21
This is a question about independent events.

Jake remembers the second and third letters of his Klyngon name, therefore the probability for these two letters is 1. For the first letter, he is confident that it´s neither "N" or "Z" and it is given that the total number of possible letters is 10. So, the probability of getting the first letter correctly is 1 divided by the total number of possible letters (in this case 8 because he knows that of the 10 letters there are two that cannot be)

I think the solution is C (1/8)
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Re: Jake remembers only the last three letters of his four-letter Klingon [#permalink]

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New post 20 Sep 2016, 12:41
There are 10 letters and we can eliminate two. Because there is only 1 correct beginning letter probability is 1/8. C
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Re: Jake remembers only the last three letters of his four-letter Klingon [#permalink]

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Re: Jake remembers only the last three letters of his four-letter Klingon   [#permalink] 05 Dec 2017, 02:32
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Jake remembers only the last three letters of his four-letter Klingon

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