Saturday

December 20, 2014

December 20, 2014

Posted by **Leyla** on Sunday, January 24, 2010 at 8:49pm.

- algebra -
**Reiny**, Sunday, January 24, 2010 at 9:43pmAnother way to ask the question,

"in how many ways can I choose any 2 of the 21 points" ?

C(21,2) = 210

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