Chapter 3.1, Problem 3.1CE

The three vectors $\stackrel{\to }{A},\stackrel{\to }{B}$ and $\stackrel{\to }{C}$ in Figure 3.7 all have the same magnitude. Which of these combinations results in a vector of zero magnitude? (More than one choice may be correct.)

1. a. $\stackrel{\to }{A}-\stackrel{\to }{B}$
2. b. $\stackrel{\to }{B}-\stackrel{\to }{A}$
3. c. $\stackrel{\to }{A}-\stackrel{\to }{C}$
4. d. $\stackrel{\to }{C}-\stackrel{\to }{A}$
5. e. $\stackrel{\to }{A}+\stackrel{\to }{C}$