Q A Bank's website requires users to use a password with the following characteristics. - The password must be of length 10. - each entry can be a 1 digit number, an upper case letter, a lower case letter, or a symbols from the list: #, $, %, ? &. . a) How many passwords are possible? b) Pedro decided to not repeat any entry. How many different passwords can Pedro create? C) A shipment of 50 wireless keyboards includes 7 defective units. A startup company is purchasing 15 of these keyboards. a) What is the probability that the company receives no defective keyboards? b) What is the probability that the company receives all of the defective keyboards