Posted by **Preston** on Monday, January 22, 2007 at 7:52pm.

What will be the digit in the tens place of the sum of the following expression: 7 + 77 + 777 + 7777 + ... + 7777777777777777777

1. (The same as if you added 5x7 and 4x70) The numbere in the 100's and higher places don't contribute to the amount in the tens place

3

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