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avohden
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27 Nov 2013, 22:15
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
20% (02:33) correct
80%
(02:20)
wrong
based on 123
sessions
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A bag contains six tokens, each labeled with one of the integers from 1 to 6, inclusive. Each integer appears on one token. When three tokens are removed at random, without replacement, what is the probability that the sum of numbers on those three tokens is equal to the positive integer N?
(1) There is only one combination of three tokens in the bag that sums to N
(2) N is a multiple of 7
No explanation provided - Need help in solving.
(1) There is only one combination of three tokens in the bag that sums to N
(2) N is a multiple of 7
Attachment:
632444379.png
No explanation provided - Need help in solving.
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27 Nov 2013, 23:12
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Actually, I think A is a better answer than D.
Reasons:
Statement 1) Whatever N is, there is only one combination to give it. N cannot be all 6,7,14 and 15. So probability has to be 1/20. Sufficient.
Statement 2) What if N = 7000. In that case answer is 0. Insufficient.
Reasons:
Statement 1) Whatever N is, there is only one combination to give it. N cannot be all 6,7,14 and 15. So probability has to be 1/20. Sufficient.
Statement 2) What if N = 7000. In that case answer is 0. Insufficient.
Edit: Tough one.. I thought the answer was an easyD
A... 
27 Nov 2013, 23:24
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Probability of getting sum of N from 3 tokens= no. of combinations from 3 tokens which leads to N/ total sum of combination from 3 token
1)---> only 1 combnination of exists which leads to N... Hence, total outcomes =20.. using 6C3... 1/20..
2) N is a multiple of 7.. Two such combinations exist.. 1,2,4 = 7 and 3,6,5 = 14... Probabilty = 2/20
Both the statements seem to contradict each other
What is OA ???
Dont know what am I missing here
1)---> only 1 combnination of exists which leads to N... Hence, total outcomes =20.. using 6C3... 1/20..
2) N is a multiple of 7.. Two such combinations exist.. 1,2,4 = 7 and 3,6,5 = 14... Probabilty = 2/20
Both the statements seem to contradict each other
What is OA ???
Dont know what am I missing here
