railway RRB Technician Grade 1 Mock Test 2024 Mathematics Sets Set Theory and types of Sets

यदि B = {x : x ∈ N जिससे x2 + 11x + 30 = 0 है} है तो B क्या है?

1
रिक्त समुच्चय 
2
सीमित समुच्चय 
3
अनंत समुच्चय 
4
इनमें से कोई नहीं 
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