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What percentare of numbers from 1 to 70 have squares that end in the digit 1 |
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Answer» 20%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. % = 20%. |
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