Chapter 2.2A, Problem 3A

Which of the following pairs of sets can be placed in one-to-one correspondence?

a. $\left\{1,2,3,4,5\right\}$ and $\left\{m,\text{ n},\text{ o},\text{ p},\text{ q}\right\}$.

b. $\left\{a,b,c,d,e,f,\dots ,m\right\}$ and $\left\{1,2,3,4,5,\text{ 6,}\dots \text{, 13}\right\}$.

c. $\left\{x|x\text{ is a letter in the word }mathematics\right\}$ and $\left\{1,2,3,4,\dots \text{, 11}\right\}$.