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What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit? |
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Answer: Option C Explanation: 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
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Required percentage =
% = 20%.Post your comments here:
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