Suppose a bookcase has 200 books, 70 in French, and 100 about mathematics. How many non-french books not about mathematics are there if there are 60 french no mathematics books
By inclusion and exclusion principle
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Answer:
10
Step-by-step explanation:
total no. of books are 200 but 100 books are maths so we do not need them.
therefore we now consider only the rest 100.
out of which 70 are french but 60 are french no maths so the rest 10 are non french no maths books
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