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QUESTION
Q
What percentage of numbers from 1 to 70 have squares that end in the digit 1 ?

Solution

The numbers from 1 to 70 whose squares end with 1  are: 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69There...

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Solution

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