Asked by Celina

How many different seven-digit telephone numbers are possible if no number may begin with 0?.....the answer is 9,000,000 but I'm not sure how to get that, plz explain:)
Answered by Reiny
first number could be 9 different digits, but after that we can use 10 different ones each time
so
9x10x10x10x10x10x10 = 9 000 000
Answered by Celina
Ok thank you:)
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