Q&R Probability question

[Wicked]

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one more question..

Kate has 6 different books. assuming the order of selection doesn't matter, how many ways can Kate select, from these 6 books, 2 different books?

im sure this is an easy, basic problem..but i always had trouble understanding probability problems..
thanks for your help!

 

[OrangeStorm]

I believe for this problem, you need use combination formular, nCr=n!/[r!(n-r)!], where n= 6, r= 2.

 

[Wicked]

do you mean 6!/4! ?
this gives me 30. and i got it wrong..

 

[Wicked]

hold on..
I GOT IT!!! thank you!! i forgot the 2!
thank you!!!