Final answer:
There are 4 different ways to choose three different muffins out of four varieties.
Step-by-step explanation:
To find the number of different ways to choose three different muffins out of four varieties, we can use the combination formula. The formula for combinations is given by nCr = n! / (r!(n-r)!), where n is the total number of items and r is the number of items to be chosen. In this case, n = 4 (four varieties of muffins) and r = 3 (choose three muffins).
Substituting the values, we get 4C3 = 4! / (3!(4-3)!) = 4.
Therefore, there are 4 different ways to choose three different muffins out of four varieties.