Number of 4 digit positive integers if the product of the digits is divisible by 3
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total numbers=9000.If a number has at least one of digit as 0,3,6,9 then the product can be divisible by 3.So left digits are 1,2,4,5,7,8 i.e 6 digits.total numbers by these 6 digits are 6^4=1296. so total numbers divisible by 3 are: 9000-1296=7704
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