Maria buys n pencils that cost p cents each. She pays with a $y note.
Find, in terms of n, p and y, the amount of change Maria receives.
Give your answer in cents.

For the chance to be team captain, the numbers 1-30 are put in a hat and you get two chances to pick a number, without replacement. which formula correctly shows how to find the probability that you choose the number 1 and then 2?