Asked by Timileyin
out of 80 student ss3 if each student offer at least one of chemistry and physics if 50 student offer chemistry and 42 offer physics.How many student offer chemistry only
Answers
Answered by
oobleck
no idea what the "ss3" means.
if all take something, then if x take both,
50+42-x = 80
find x, and then 50-x do chemistry only
review Venn diagrams and inclusion-exclusion
if all take something, then if x take both,
50+42-x = 80
find x, and then 50-x do chemistry only
review Venn diagrams and inclusion-exclusion
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