Operations with sets

The set B - A has twice as fewer elements than the set A - B and four times fewer elements than the set A ∩ B. How many times more elements does the set A have than the set B?

Correct result:

k =  1.2

Solution:

BA=n AB=2n AB=4n  k=A/B k=ABABBAAB  k=2n+4nn+4n  k=2+41+4=65=1.2



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