Mathematics, 19.05.2020 14:04, SKYBLUE1015

How many 7-digit phone numbers can be formed if the first digit cannot be 0 and repetition of digits is allowed?

7,000,000

9,000,000

181,400

none of the above

Answers: 1

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How many 7-digit phone numbers can be formed if the first digit cannot be 0 and repetition of digits...