Grace and ellie are in different geometry classes. there are only two geometry classes at their high school. two students are being picked to attend a special math competition, one student from each class. if there are 20 students in one class and 26 students in the other, find the probability that both grace and ellie will be picked to attend the competition. show all work to receive full credit for this question.

Consider a bag that contains 220 coins of which 6 are rare indian pennies. for the given pair of events a and b, complete parts (a) and (b) below. a: when one of the 220 coins is randomly selected, it is one of the 6 indian pennies. b: when another one of the 220 coins is randomly selected (with replacement), it is also one of the 6 indian pennies. a. determine whether events a and b are independent or dependent. b. find p(a and b), the probability that events a and b both occur.