In the following question, two statements are numbered as A and B. On solving these statements, we get quantities A and B respectively. Solve both quantities and choose the correct option.

Quantity I: Three coins are tossed simultaneously. Find the probability that at least one head.

Quantity II: There are 2 backpacks and 3 school bags are kept in a box. Two bags are chosen randomly without replacement. Find the probability that at least one bag is a school bag.