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A serial number is to be created for each product that is manufactured. The serial number...

A serial number is to be created for each product that is manufactured. The serial number consists of 2 letters followed by 3 non-zero digits. There are a total of 26 letters in the alphabet.

(a) How many serial numbers are possible if all the letters and non-zero digits CAN'T be repeated?    

(b) How many serial numbers are possible if the letters and non-zero digits can be CAN be repeated?

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Answer #1

26 25 9 8 7 ways Sol. The serial number consists of a letters followed by 3 non-reso digits. Lettest (a) Total number of ser

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