Question 873295
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Hi
x 2x  (2x-4)= unit digit
1  2    -2 |wont work  2*-2 &#8800; 2
2  4    0 |wont work  2*0 &#8800; 4
3  6    2 |wont work 2*2 &#8800; 6
4  8    4  
 84 is the number