In Jack's piggy bank, there is a collection of pennies, nickels, dimes, and quarters which amounts to $2.87 The number of quarters is one less than twice the number of nickels. There are 4 more pennies than nickels.
The number of dimes is twice the number of pennies. How many coins of each kind are there

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.