Overlapping Sets

Question 1

What are the two formulas for # unique in 2 sets?

Answer 1

A only + B only + Both + Neither = Total Number of Unique Elements

A + B - Both + Neither = Total Number of Unique Elements

Question 2

How do we find the number of items in A OR B?

Answer 2

A OR B = A + B - (A and B)

Question 3

How do you find the number of members in only 1 group for 3 overlapping sets

Answer 3

Members In One Group = # in A Only + # in B Only + # in C Only

Question 4

How do you find the number of members in 2 of the 3 groups for 3 overlapping sets?

Answer 4

Number in B and C Only = B and C - A and B and C

Question 5

What are the two formulas for # unique in 3 sets?

Answer 5

Total # Unique Members = #A Only + #B Only + #C Only + 2 Groups Only + All 3 Groups Only + Neither

Total # Unique Members = (A + B + C) - (Sum of 2 Members) - 2 * (All Three Members) + Neither