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{a} ∈ A means {a} must be present as element in set A.

whereas,a ∈ A means only a must be present as element in A

Example:let A={ {a},b,c,{b,c}} then {a} ∈ A is correct but a ∈ A is NOT.

and let B={a,b,{c,d}} then a ∈ B is correct but {a} ∈ B is not.

HOPE IT WILL BE CLEAR NOW :)

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