### Home > CCA2 > Chapter 1 > Lesson 1.2.4 > Problem1-118

1-118.

Have you ever wondered why so many equations are written with the variables x and y? Suppose you are reaching into a bag that contains all the letters of the English alphabet, and you pull out one letter at random to use as a variable in equations. Homework Help ✎

1. What is the probability that you pull out an x?

$P(\text{`x'}) = \frac{1}{\text{number of letters in the alphabet}}$

2. If you got the x, now what is the probability that you pull out a y?

After you take out x, how many letters are left in the alphabet?