1.

Find the unit digit of (717)7531. 72. 83. 94. 6

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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