Recall the formula for a combination, _n C_r = n!/r!(n-r)!.
20
Practice makes perfect
To evaluate the given combination, we will use the corresponding formula.
_n C_r = n!/r!(n-r)!
We are given that n=6 and r=3. Let's substitute these values into the formula.
We can evaluate the number of combinations _6C_3 using the graphic calculator. To do so, we have to start by entering the number of items, which is equal to 6.
Next, we push MATH and scroll right until we reach PRB. Then, we scroll down to the third row and push ENTER.
Finally, by entering the number of items to be chosen and hitting ENTER, we can calculate the number of combinations.
