railway RRB Technician Grade 1 Mock Test 2024 Mathematics Sets Operations on Sets

যদি A - B = ϕ হয়, তাহলে বিকল্পগুলির মধ্যে কোনটি সঠিক?

1
\(\rm A\nsubseteq B\)
2
A ⊂ B
3
B ⊂ A
4
কোনোটিই না
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