help me with the following questions

QUESTION 2 la} A bank password consists of two letters ofthe English alphabet followed by two digits. How many different passwords are there? {b} There are fteen balls in a container of which eight are red and seven are black. In how many ways can five balls be chosen so that at least three balls are black. {cl How many choices of 10 chocolates are possible if there are 5 types of chocolate? [4+5+4=14] QUESTION 3 Use the Pfgeonhole Principle to show that if 46 people each choose a cooldrink from 5 possible types and a chocolate from 9 types, then at least two will choose the same could rink and chocolate. CLEARLY STATE what the pigeons and the pigeonholes are. [5]