If A and B are disjoint and n(A)=9 n(B)=11 then what is n(A ∪ B)?
यदि A और B disjoint हैं और n(A)=9 n(B)=11 है तो n(A ∪ B) कितना होगा?
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Correct Answer
D. 20 / 20
ExplanationStep 1: Disjoint sets have no common element. Step 2: Therefore n(A ∪ B)=9+11=20. Step 3: When you see disjoint take intersection as zero.
Step 1: Disjoint sets में common element नहीं होता। Step 2: इसलिए n(A ∪ B)=9+11=20 है। Step 3: Disjoint शब्द दिखे तो intersection zero मानें।