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Find the unit digit of (717)7531. 72. 83. 94. 6 |
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Answer» Correct Answer - Option 1 : 7 Concept: A number with unit digit 7 have repeating cycle of 7,9,3 and 1 after every fourth power. Explanation: Power series of 7 i.e. unit digit 7 power expansion has 7,9,3 and 1 and it is raised to power 753 i.e. 753 ÷ 4 = 188, remainder is 1 So, (717)1= 7 |
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