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What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit? ?->(Show Answer!)
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1. What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?





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  • By: guest on 01 Jun 2017 05.47 pm
    Clearly, the numbers which have 1 or 9 in the unit's digit, have squares that end in the digit 1. Such numbers from 1 to 70 are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69. Number of such number =14 Required percentage = 14 x 100 % = 20%. 70
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