Teaching OSSTET Mock Test 2023 Mathematics Sets Set Theory and types of Sets

दिया  है n(U) = 20, n(A) = 12, n(B) = 9, n(A ⋂ B) = 4, जहाँ U सार्वत्रिक समुच्चय है, A और B, U के उपसमुच्चय हैं, तब n((A ⋃ B)c) क्या होगा?

1
17
2
9
3
11
4
3
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