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'Weekly Problem 37 - 2006' printed from http://nrich.maths.org/

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The 8-digit number 1234*678 is a multiple of 11. Which digit is represented by *?

 

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.                                                                                                                 

This problem is taken from the UKMT Mathematical Challenges.

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