यदि (n(U)=80), (n(A)=35), (n(B)=42) और (n\(A \cap B\)=18), तो (n(\(A \cup B\)')) क्या होगा?

If (n(U)=80), (n(A)=35), (n(B)=42), and (n\(A \cap B\)=18), what is (n(\(A \cup B\)'))?

Explanation opens after your attempt
Correct Answer

A. (21)

Step 1

Concept

(n\(A \cup B\)=35+42-18=59), so the complement is (80-59=21). Find the union first, then take the complement.

Step 2

Why this answer is correct

The correct answer is A. (21). (n\(A \cup B\)=35+42-18=59), so the complement is (80-59=21). Find the union first, then take the complement.

Step 3

Exam Tip

(n\(A \cup B\)=35+42-18=59), इसलिए पूरक (80-59=21) है। पहले संघ निकालें फिर पूरक लें।

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Mathematics Answer, Explanation and Revision Hints

यदि (n(U)=80), (n(A)=35), (n(B)=42) और (n\(A \cap B\)=18), तो (n(\(A \cup B\)')) क्या होगा? / If (n(U)=80), (n(A)=35), (n(B)=42), and (n\(A \cap B\)=18), what is (n(\(A \cup B\)'))?

Correct Answer: A. (21). Explanation: (n\(A \cup B\)=35+42-18=59), इसलिए पूरक (80-59=21) है। पहले संघ निकालें फिर पूरक लें। / (n\(A \cup B\)=35+42-18=59), so the complement is (80-59=21). Find the union first, then take the complement.

Which concept should I revise for this Mathematics MCQ?

(n\(A \cup B\)=35+42-18=59), so the complement is (80-59=21). Find the union first, then take the complement.

What exam hint can help solve this Mathematics question?

(n\(A \cup B\)=35+42-18=59), इसलिए पूरक (80-59=21) है। पहले संघ निकालें फिर पूरक लें।