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Sonic bought a combination lock that opens with a four digit number created using digits 0 through 9. The same digit cannot be used more than once. Sonja wants the last digit to be a 7 and the order of the digits matters. How many ways can the remaining digits be choosen



Answer :

Answer:

Step-by-step explanation:

You have 9 choices for first digit

   then eight choices for second

     then seven choices for third digit

           and one choice ( 7)  for last digit

9 x 8 x 7 = 504 choices

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