How long will it take him to try each possibility

Reference no: EM13688929

Jay can remember only the first 4 digits of his friends phone number. He also knows that the number has 7 digits and the last digit is not a zero. if jay were to dial all of the possible numbers and it takes him 21 seconds to try each one, how long will it take him (in total) to try each possibility?

Reference no: EM13688929

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