basic counting principles

A telephone number consists of 7 digits. How many phone numbers are possible if the first digit is neither 1 nor 0

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1 Answer

for 6 digits, possabel numbrs=10^7 -1

(kant yuze 000000)

add 1 more digit, but exclude 0 & 1...8 possabel

anser=8*(10^7 -1)
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