Question 355988

Digit can be display  001 to 999 

so, total no. of ways = 999

you can also find it by ( 10^3 - 1 ) because there are 3 digits and at each 

place


any digit 0-9 can be used, but only one sequence 000 will be not use, because it 

is actually zero, number can be start from 001.



and no. of ways to put letter = 26 * 26  (any one of a-z can be used)


so, total no. of ways = 999 * 26 *26 =  675324



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