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#4 Addition subtraction
Set by Katie Steckles
It is true that 1 + 2 + 3 = 3 + 2 + 1, and the equation remains true if you remove two of the plus symbols: 1 + 23 = 3 + 21.
Starting from the equation 1 + 2 + 3 + 4 = 4 + 3 + 2 + 1, delete three of the plus symbols so the equation is still true.
Can you find a way to do the same for 1 + 2 + 3 + 4 + 5 = 5 + 4 + 3 + 2 + 1, but this time by removing a different set of three pluses than you did in the previous case?
Solution next week
