Make it correct
This is obviously incorrect. You have to make it correct by removing some digits and/or plus signs (if you remove the plus sign between 1 and 2, you get 12)
What is the minimum number of digits and/or plus signs you have to remove to make the above identity correct?
The answer is 1.
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1 solution
Remove the + between 5 and 6 .
Then we have 1 + 2 + 3 + 4 + 5 6 + 7 + 8 + 9 + 1 0 = 1 0 0 , which is true. Done!