Question
Find the last digit of 72009.___
Answer: Option A
:
This question is based on the power cycle of 7.
2009 is of the form 4k+1.
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:
This question is based on the power cycle of 7.
2009 is of the form 4k+1.
The power cycle of 7 is 7,9,3,1. Thus, 4k+1 is 7 itself. Answer is option (a).
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