Error in Ch 4 Question 21

[movemint]

Found an error in one of the prove by method exhaustion questions, in which for one the expressions summed for 22, 2^2 + 2^2 + 3^2 equals 17, and not 22.

This should be rewritten to 2^2 + 3^2 + 3^2, as 4 + 9 + 9 = 22.

Hope this helps anyone out with their day.

[spamegg1]

Closed by #45 thanks a lot!