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Concatenation sum (Posted on 2019-05-15) Difficulty: 3 of 5
The number 123456789 is concatenated 1729 times to form a number A

Similarly, the number 987654321 is concatenated 1729 times to form another number B

If A+B=C, find the sum of digits of C

No Solution Yet Submitted by Danish Ahmed Khan    
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  Subject Author Date
Solutioncomputer-aided solutionCharlie2019-05-15 11:23:30
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