Question

You are given the following data about Group B. 28 students in Group B have taken Math 2A, 28 have taken Math 2B, and 25 have taken Math 2C. 11 have taken both Math 2A and 2B, 9 have taken both Math 2A and 2C, and 10 have taken both Math 2B and 2C. 3 have taken all three classes. How many students are in Group B?

Answer 1

Answer:

54

Step-by-step explanation:

n(AUBUC= n(A) + n(B) + n(C) - n(A^B) - n(A^C) - n(B^C) + n(A^B^C)

28 + 28 + 25 - 11 - 10 - 9 + 3 = 54

If you don't know the formula, use venn diagram