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Compute the expression below given that each number has 100 digits:

 Sep 28, 2020
 #1
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All you need to do is to use the last 2 digits of each number, and the other 98 digits cancel each other, and you will get the same result:

 

[83  x  85]  -  [81  x  87] =7,055  -  7,047 = 8 - which is the result.

 Sep 28, 2020

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