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OpenStudy (anonymous):
how many different 7-digit telephone numbers can be made if the first digit cannot be 7,8, or 9
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OpenStudy (anonymous):
you start with 6543210
OpenStudy (campbell_st):
so how many choices for the 1st digit...?
OpenStudy (anonymous):
multiply them and thats your ans
OpenStudy (anonymous):
nevermind I think im wrong :P
OpenStudy (anonymous):
7
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OpenStudy (anonymous):
there are 7 choices for the first digit
OpenStudy (campbell_st):
great and are you happy there and 10 choices for each of the other digits..?
OpenStudy (anonymous):
yes, so how do I solve this problem from there?
OpenStudy (anonymous):
also, sorry for the late reply
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