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Source: — Problem Solving |
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by fbgeoff » Tue Nov 01, 2011 10:04 am
Sorry about how little the image is. The answer shown is wrong. Needing help on how to solve this. Thanks
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by shankar.ashwin » Tue Nov 01, 2011 10:08 am
You could search for the problems in the forum, most of them are discussed several times and a lot of experts have given some great solutions.
GMATPrep problems are one the most discussed problems in the forum.
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by rijul007 » Tue Nov 01, 2011 10:13 am
Total no of selections = 12*4 = 48
As each student selected 2,
Total no of students = 48/2 = 24

Option D
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by saketk » Tue Nov 01, 2011 11:20 am
fbgeoff wrote:Sorry about how little the image is. The answer shown is wrong. Needing help on how to solve this. Thanks
You can solve this without any complex Math [ i.e. if you don't want PnC concepts here]

Suppose we have 6 pairs (2 *6 = 12 songs)

Let, first pair has 2 songs A and B. Since, we already know that each song is selected 4 times, you can assume that 'A' and 'B' were selected by 4 students. i.e. 1 pair is selected by 4 random students.

Now, that pair is out of next selection. we have 5 more pairs left. Just multiply 5 by 4.

Total = 20 + 4 [ of first selection ]

Your answer = [spoiler](24)[/spoiler]
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