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OpenStudy (anonymous):
a compnay wants to have 3 digit phone extensions with the 1st digit not being zero
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OpenStudy (dumbcow):
1st digit can be any number from 1-9 (9 choices) 2nd digit can by 0-9 (10 choices) 3rd digit can be 0-9 (10 choices) 9*10*10 = 900 900 different extensions
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