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Find the remainder when 7^7 is divided b...

Find the remainder when `7^7` is divided by 4.

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`7^7/4=7xx7xx7xx7xx7xx7xx7/4`
=`3xx3xx3xx3xx3xx3xx3/4=9xx9xx9xx3/4`
=`1xx1xx1xx3/4`=3/4
Thus the requried remainder is 3.
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