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GMAT PREP - Combination

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Source: — Problem Solving |
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by raajan_p » Fri Nov 28, 2008 3:45 pm
We know that the total # of combinations -> 150

We know the number of chair combinations -> 5C2 =>10

So inorder for the total combination to be 150, the number of table combination has to be 15

Two tables have to be selected from X number of tables.

XC2 = 15 => x(x-1)/2 =15 => x(x-1) = 30

From here we can find that X = 6.

So,

6C2 => 6*5/1*2 = 15

So in total, 10*15 = 150 combinations.
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