Betsy is making a flag. She can choose three colors from red, white, blue and yellow. How many choices does Betsy have?
To find out how many choices Betsy has, we need to determine the number of different combinations of colors she can choose. Since Betsy can choose three colors, and there are four options to choose from (red, white, blue, and yellow), we can use the formula for finding combinations to calculate the answer.
The formula for finding the number of combinations is:
nCr = n! / r!(n-r)!
where n is the number of options to choose from, and r is the number of choices.
In this case, n = 4 (the number of colors) and r = 3 (the number of choices). Let's calculate:
4C3 = 4! / 3!(4-3)!
= (4 * 3 * 2 * 1) / (3 * 2 * 1)(1)
= 4
Therefore, there are 4 different choices that Betsy can make for her flag.