janRa4schin9o janRa4schin9o

28-06-2016
Mathematics

Answered

a 4-digit password is a number that begins with a 3 and does not contain a zero or nine. if digits can be repeated, how many possible passwords are there?

Verified Answer :

28-06-2016

Hello,
it remainds 8 digits: 1,2,3,4,5,6,7,8

888=512 possibilities;

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