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20 POINTS PLEASE ANSWER THIS ASAP!!!!!


How many six-character code words can be formed if the first two characters are letters and the others are letters and/or digits? Repetition of numbers and letters is allowed.



a) 6,760,000


b) 723,465,600


c) 1,135,420,416


d) 918,918,000


2.Answer question # 1 if Repetition is NOT allowed.
a) 918,918,000

b)723,465,600

c)1,135,420,416

d)720

Respuesta :

amazingpeeve

Answer:

A ; 3276000 (second answer)

Step-by-step explanation:

think of it like this:

L        L       #      #      #    # ( six symbols, L for letters, # for numbers)

26 X 26 X 10 X 10 X 10 X10 = 6760000

If we take away repetition then the equation would look like this:  

L       L       #     #     #    #   ( 26 then 25 due to the loss of a letter due to no  )

26 X 25 X 10 X 9 X 8 X 7   ( Repetition. Same with 10,9,8,7                               )  

Therefore the answer to the second question isn't even up there which is 3276000.

Hope this helps...

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