Question

If Dwight Johnson has 7 courses to choose​ from, how many ways can he arrange his schedule if he must pick 4 of​ them?

Answer 1

35 ways

Explanation:

`_7C_4=(7!)/(4!(7-4)!)=(7!)/(4!*3!)=(7*6*5)/(3*2*1)=(210)/(6)=35`

Therefore, Dwight can arrange his schedule in 35 ways if he must pick 4 out of 7 courses to choose from.