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Number Patterns and Problem Solving

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Source: — Problem Solving |
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by mathbyvemuri » Fri May 11, 2012 7:22 pm
It's a combinations problem.
As order is not considered, combinations are considered. If order matters, permutations are considered.
=> number of 4-person groups selected from 18 persons = 18C4
= 18*17*16*15/4*3*2*1 = 3060
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