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Probability Question
[#permalink]
06 Sep 2010, 18:50
An electronic clock shows time in hours and minutes. For example, 08:15 means that it is now a quarter past eight. If one looks at the clock at some time between 6:00 and 9:00, what is the probability that he will see the digit 8 ?
The answer to this question is 2/5 arrived thus: 72 minutes with 8 in display, a total of 180.
My question is if I added all the numbers in display between 600 and 900 (inclusive) then I get 181 total. For example 600-659 - 60 #s 700-759 - 60 #s 800-859 - 60 #s 900 - 1 # Total 181 of which there are 6 in the first group, 6 in the second group and 60 in the third that have 8 in display. So should not the probability be 72/181?
Archived Topic
Hi there,
Archived GMAT Club Tests question - no more replies possible.
Re: Probability Question
[#permalink]
06 Sep 2010, 19:00
1
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mainhoon wrote:
An electronic clock shows time in hours and minutes. For example, 08:15 means that it is now a quarter past eight. If one looks at the clock at some time between 6:00 and 9:00, what is the probability that he will see the digit 8 ?
The answer to this question is 2/5 arrived thus: 72 minutes with 8 in display, a total of 180.
My question is if I added all the numbers in display between 600 and 900 (inclusive) then I get 181 total. For example 600-659 - 60 #s 700-759 - 60 #s 800-859 - 60 #s 900 - 1 # Total 181 of which there are 6 in the first group, 6 in the second group and 60 in the third that have 8 in display. So should not the probability be 72/181?
Read the question in red, it said time in between 6-9 that means we should exclude the case 9:00. The person will start at 6:00 and end at 8:59. He does not look at the 9:00 value.
Re: Probability Question
[#permalink]
06 Sep 2010, 19:22
Well gurpreetsingh, what I don't understand is if I said between X and Y (and meant neither is inclusive) I should treat both the same, meaning if I exclude Y I also exclude X. In this case I then should exclude 600 and 900 so the total is now 179, why retain 600 and exclude 900?
Re: Probability Question
[#permalink]
06 Sep 2010, 22:56
mainhoon wrote:
Well gurpreetsingh, what I don't understand is if I said between X and Y (and meant neither is inclusive) I should treat both the same, meaning if I exclude Y I also exclude X. In this case I then should exclude 600 and 900 so the total is now 179, why retain 600 and exclude 900?
Yar, dont mind but I have seen in many of your posts, you give more emphasis on solving the question rather than learning from it I might be wrong but I cant resist myself pointing out something. :-D
This problem is little ambiguous and might not appear on the exam. If you read my previous post again I have clearly mentioned that "Read the question in red, it said time in between 6-9 that means we should exclude the case 9:00. The person will start at 6:00 and end at 8:59. He does not look at the 9:00 value."
He will start at 6:00:00 , at 6:00:01 ( here 01 are secs) he will still see 6:00 on the digital clock. This will be continued till 8:59:59. As he will look at the clock between 6:00 and 9:00, he still has 60 secs post 6:00 to consider 6:00 case. This is the reason 6:00 is included and 9:00 is not.
PS: Don't mind for my harsh words, that's my way to motivate people. If you are not able to understand anything, you are always welcome. But I advice you to spend some time,even an hour to know your doubt. Learning from own mistakes is the best way to learn.
Archived Topic
Hi there,
Archived GMAT Club Tests question - no more replies possible.