Jacob purchased a DVD player online. He paid $25.95 less than the price of the same item at a local store: $159. What did Jacob pay for
his DVD player?

$133.05

Step-by-step explanation:

Since the price at the store is $159, the answer should be 159-29.95.

There are, you see, 3 x 2 x 1 = 6 possible ways of arranging the three digits. Therefore in that set of 720 possibilities, each unique combination of three digits is represented 6 times. So we just divide by 6. These are what are mathematically called "combinations".