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0 numbers can be formed coz using seven digits n forming a three digit is impossibleb bcoz numbers between 100 n 1000 there are only three digit numbers..i.e' from 101 to 999.........hope i helped u:)
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There can be no numbers formed by using all digits 1,2,3,4,5,6,7    because I will turned into a seven digit number and there is no seven digit number between 100 and 1000
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