At oxnard university, a student id consists of two letters (26 possibilities) followed by four digits (10 possibilities). (a) how many unique student ids can be created?

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.