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Power 2: units digit 9. Multiply by 49 again to get power 4: units digit 1. So every 4th power gives units digit 1. So 16th power has units digit 1, so the previous power, the 15th must have units digit 3.

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โˆ™ 2012-07-21 23:45:54
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Q: What is the units digit of 7 to the 15 power?
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