Question: a) To log on to a certain computer account, the user the user must type in a 3-letter password. In such a password, no letter

a) To log on to a certain computer account, the user the user must type in a 3-letter password. In such a password, no letter may be repeated, and only the lower case of a letter may be used. How many such 3-letter passwords are possible ? (There are 26 letters in the alphabet.)

b) How many different committees of size 3 can be formed from 14 people?

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