Answer Posted / vinay rajesh

2^51=2^25*2^26
2^25=2^5^5
2^26=2^5^5*2
2^5^5 ends with 2 as 2^5ends wirh 2 and when raised 5 times gives 2 so
2^5^5*2 gives 2*2
finally 2*2*2=8

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