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by selango » Thu Jul 22, 2010 9:57 pm
what is the source of this question?It don't appear like GMAT..
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by singhpreet1 » Thu Jul 22, 2010 10:00 pm
Pinku wrote:From the set of numbers: {1, 2, 3, 4, 5, 6}, how many different sums can be formed by summing up any two numbers in the set?
we must take 2 numbers out of 6, therefore 6C2.

6C2= 15


alternatively,
combinations with 1= 12,13,14,15,16
combinations with 2= 23,24,25,26
combinations with 3= 34,35,26
combinations with 4= 45,46
combinations with 5= 56
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Last edited by singhpreet1 on Thu Jul 22, 2010 11:37 pm, edited 1 time in total.
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by outreach » Thu Jul 22, 2010 11:03 pm
6C2
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