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On multiplying a number by 7, all the di...

On multiplying a number by 7, all the digits in the product appear as 3’s. The smallest such number is 47619    (b) 46719      (c) 48619      (d) 47649

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  16. The digit in the units place of the number 123^(99) is 1 (b) 4 (c) ...

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