Question 818799
The letters of the word STATISTICS are written on ten identical cards. If two cards are drawn at random, what is the probability that one 'S' and one 'I' will occur?
<pre>
There are 3 S's and 2 I's.

{{{P(matrix(4,1,

DRAWING,AN,S,FIRST))P(matrix(4,1,

DRAWING,A,I,SECOND))}}}{{{matrix(1,1,"+")}}}{{{P(matrix(4,1,

DRAWING,A,I,FIRST))P(matrix(4,1,

DRAWING,AN,S,SECOND))}}} {{{""=""}}} {{{(3/10)(2/9)}}}{{{""+""}}}{{{(2/10)(3/9)}}}{{{""=""}}}{{{6/90+6/90}}}{{{""=""}}}{{{12/90}}}{{{""=""}}}{{{2/15}}}.

Edwin</pre>