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80
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If a, b, c, and d are replaced by four distinct digits from 1 to 9, inclusive, then what's the largest possible value of the difference a.b - c.d ?

 Dec 9, 2019
 #1
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+1

The largest possible difference  occurs   when

 

a b   -  c d   =

 

98   -  21   =

 

77

 

Or.....if we are multiplying

 

a* b  - c * d  =

 

9 * 8  -  2 * 1   =

 

72  -  2   =

 

70

 

 

cool cool cool

 Dec 9, 2019

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