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What is the unit digit of 39 46 252 + 73 47 33 ?

 
8
7
6
4

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As last digit of 39(46)((252)) is 1 similarly, we cn do 4 another 1 i.e. 73(47)((33)) 47(33) when 33 divide by 4 we get 1 a a remiander then47(1) give 47 73(47) when 47 divide by 4 we get 3 a a remainder sooo we cn write it as a73(3) cube of 3 is 7 theb final answer is 1 7 =8 ( ) - power

Yes,its very simple

Can any one explain this answer???