Sunday

December 21, 2014

December 21, 2014

Posted by **BWB** on Saturday, May 8, 2010 at 12:02am.

I realize that this deals with combinations and not permutations. I just do not understand how they want this done.

- Math -
**Reiny**, Saturday, May 8, 2010 at 12:27amyou want 2 letters at a time, order not important

so

RS

RT

ST

there are only 3 cases

in combination notation

C(3,2) = 3!/(2!1!) = 6/2 = 3

**Answer this Question**

**Related Questions**

Finite Math - Please help with this problem. In a student writing contest with ...

Math: Permutations and Combinations - Need a verification: Combinations of n ...

Math/ Algebra 2 - How many different ways can the letters in the word ...

8th grade Math - Penelope created a game using a bag of 26 tiles, each with a ...

math - Following are three sets of letters. Draw one letter from Set 1 and place...

math - Following are three sets of letters. Draw one letter from Set 1 and place...

Math - We are working on permutations and combinations and the problem reads as ...

Math - Find the probability that if the letters of the word "parallel" are ...

Math - In a mathematics olympiad there are 20 finalists. In how many ways can ...

Combinations - Anna was opening a new restaurant, so she went to the sign store ...