quantitative aptitude test 71

Test # 71
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1. If A, B, C are three sets and if
|A B C| = 100, |A| = 60, |B| = 50,
|C| = 50, |A B| = 10, |B C| = 15,
|C A| = 50, then |A B C| is equal to:

Quantitative Aptitude
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side against (someone)
to choose sides against someone
My friend always sides against me when I am involved in an argument with someone.
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