Provide an appropriate response. A box contains 15widgets, 5 of which are defective. If 3 are sold at random, find the probability that
(a) all are defective
(b) none are defective.

Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?