Question 1201830
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A student has to choose an elective class for the last semester of high school. 
Her counselor suggested 9 electives, 7 of which were technology classes.
If the student randomly chose to read about 6 of the electives, 
what is the probability that all of them are technology classes?
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<pre>
In all, there are  {{{C[9]^6}}} = {{{(9*8*7)/(1*2*3)}}} = 84 of all possible different 
sextuples from 9 possible classes.


Of them, the number of all different possible sextuples  
comprised of technology classes is  {{{C[7]^6}}} = 7.


The probability the problem asks for, is  P = {{{favorable/total}}} = {{{7/84}}} = {{{1/12}}}.    <U>ANSWER</U>
</pre>

Solved.