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

यदि A - B = ϕ है, तो कौन-सा विकल्प सही है?

1
\(\rm A\nsubseteq B\)
2
A ⊂ B
3
B ⊂ A
4
इनमें से कोई नहीं
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