7. En una reunió de nois i noies el nombre de noies és 25 vegades més que el de nois. Si surten de la reunió 10 nois i 10 noies, queden el doble de noies que de nois. Quants nois i quantes noies hi havia inicialment a la reunió?

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.