Teaching DSSSB TGT Mock Test 2025 Quantitative Aptitude Number System Quick Math

दो समुच्चय A और B इस प्रकार हैं कि n(A) = 27, n(B) = 35 तथा n(A ∪ B) = 50 है, n(A ∩ B) का मान क्या है?

1
21
2
12
3
11
4
22
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