Competitive Quantitative Aptitude Algebra Set Theory

Medium

If $A$ and $B$ are two sets such that $A$ has $40$ elements,$A \cup B$ has $60$ elements and $A \cap B$ has $10$ elements,how many elements does $B$ have?

A
$40$
B
$30$
C
$45$
D
$50$

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Competitive

Quantitative Aptitude Questions

Chapter

Algebra

Subtopic

Set Theory

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