Nathan has a bag of coins. In the bag there are 10 dimes, 12 nickels, and 8 pennies. If Nathan selects two coins out of the bag without looking, what is the probability that Nathan will pick a penny out of the bag, and then without replacing the coin, choose a dime?

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years