What does {} mean in math?

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Ankit Bhatiya

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{} this bracket are used in BODMAS theorem ex . 11+2{54/2*(40-38+25)} =11+2{54/2*27}=11+2{1}=13 so first solve ( ) bracket and then solve {}
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this brackets used mathematical set and simplification questions. For example, in set , {} means null set, {1} means set with element 1 . In simplification formula with BODMAS theorem , this bracket is used.
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