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This is my question every one . Please help me have it already I had 6 as my answer. In a class of 50 student 28,22,20 of them offer physics,chemistry and biology respectively also 4 of them offer physics and chemistry but not biology,3 offer physics and biology but not chemistry,6 offers biology and chemistry but not physics if 13 of them offers physics only find number of student how offers all subject

2 answers

I sketched a Venn diagram

Looking at the diagram (you need to do this also)
28physics-4(PandC, not B)-3(PandB, not C)-P,C,B-13(p only)

so if my math is right
P,C,and B=28-4-3-13=8
The answer is 1
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