Fifty family were interviewed regarding 2 known brands of soaps they prefer to use labeled a, a and b

15 families were using brand a
20 families were using brand b
7 families were both a and b

usse venn diagram

1.how many families were using brand a only?
2.how many families were using brand b only?
3.how many families were using atlest two brands of soaps ?
4.how many families do not use any of the two brands of soap?

1

Answers

2014-06-17T20:28:34+08:00
1. 8
2. 13
3. 7
4. 22

use venn-diagram
0