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Answer : Explanation : Let the 5 digit number be represented by abcde.Then the 6 digit number, 1abcde x 3 = abcde1 (another 6 digit number)Now let Y = abcdeThen (100000 Y) x 3 = (Y x 10) 1300000 3Y = 10Y 17Y = 299999Y = 299999 ÷ 7 = 42857

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