Question 60640
Watch. It said there are 6 seniors, 4 juniors, and 3 sophmores.
So just put them in all fractions, and multiply.
{{{2/6 * 1/4 * 1/3)}}}. and it will be {{{1/3 * 1/4 * 1/3}}} and it will be: {{{1/3 * 1/4= 1/12 * 1/3= 1/36}}}. There is 1/36 chance.
-OR-
For the percentage, {{{1/36}}} is 27.7777777777777777777777777777...% or rounded up to 28% chance.