6.07 Combinations

Interactive practice questions

Evaluate $5!$5!

Easy

< 1min

Evaluate $4!6!$4!6!

Easy

< 1min

Find the value of $\frac{11!}{5!6!}$11!5!6!.

Easy

< 1min

Simplify $\frac{19!}{15!4!}$19!15!4! by identifying common factors of the numerator and denominator.

Easy

1min

understand the notion of a combination as an unordered set of r objects taken from a set of n distinct objects

use the notation and the formula (nr)=n!r!(n−r)! for the number of combinations of r objects taken from a set of n distinct objects