There are 6 items in column A and 6 items in column B. A student is asked to match each item in column A with an item in column B. How many possible (correct or incorrect) answers are there to this question?
As we can see that For Item2 there can be any of the match
So, For each item in column A there are 6 different options in column B since we don't have to think about correct or incorrect matching.
So possible number of combinations possible to answer:
$6 \times 5 \times 4 \times 3 \times 2 \times 1=720$