erikacerese2012 erikacerese2012

23-11-2014
Mathematics

Answered

Solve the problem.

Mark can remember only the first 4 digits of his friend's phone number. He also knows that the number has 7 digits and that the last digit is not a 0. If Mark were to dial all of the possible numbers and if it takes him 21 seconds to try each one, how long would it take to try every possibility?

Answer :

michelle2009cut michelle2009cut

23-11-2014

1234xxx0 1`= 21 x3 2= 21x 3 3 =21x3 4= 21x 3 5=21x3 6=21x3 7=21x3 8=21x3 9=21 x3 irt will take him 588 secs

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