SOLUTION: a security code for a building consists of six digits. determine the number of security codes possible if the first digit cannot be zero and repetition is permitted?

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Question 918658: a security code for a building consists of six digits. determine the number of security codes possible if the first digit cannot be zero and repetition is permitted?
Answer by Alan3354(69443) About Me  (Show Source):
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a security code for a building consists of six digits. determine the number of security codes possible if the first digit cannot be zero and repetition is permitted?
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The 1st digit is 1 of 9, the other 5 are 1 of 10.
--> 9*10*10*10*10*10
= 900,000