AMC 10B 2010 Problem 9

Lucky Larry’s teacher asked him to substitute numbers for a, b, c, d, and e in the expression a-(b-(c-(d+e))) and evaluate the result. Larry ignored the parentheses but added and subtracted correctly and obtained the correct result by coincidence. The numbers Larry substituted for a, b, c, and d were 1,2,3, and 4 , respectively. What number did Larry substitute for e ?

Answer Choices
A. -5
B. -3
C. 0
D. 3
E. 5