Question 983585
A student must answer 8 out of 10 questions.How many choices does he have if the first 3 questions have to be answered?

Solution:
The number of questions remaining after answering the first 3 questions is 7.
The student must select 5 of the remaining 7 questions.
Therefore, we simply compute the number of combinations of 7 objects taken 5 at a time.
{{{(matrix(2,1,7,5))}}} = {{{highlight(21)}}}