Chapter 2.2B, Problem 3A

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

a. $\left\{1,2,3,4\right\}$ and $\left\{w,c,y,z\right\}$.

b. $\left\{1,2,3\text{,}\dots \text{, 25}\right\}$ and. $\left\{a,b,c,d,\dots ,x,y\right\}$

c. $\left\{x|x\text{ is a letter in the word }geometry\right\}$ and $\left\{1,2,3,4,5,6,7,8\right\}$.