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The serial number on a bill consists of a letter followed by eight digits and then a letter. How many serial numbers are possible, giving the following conditions

 

(a) letters and digits cannot be repeated

(b) letters and digits can be repeated

(c) the letters are nonrepeated consonants and the digits can be repeated ( let y be a consonant)

 Mar 28, 2021
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6.5 * 10^10

laugh

-WillBill

 Mar 28, 2021

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