Two sets $A = {a, b, c, d}$ and $B = {b, c, d, x}$ are equal sets, iff $x =$

a

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b

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c

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Solution

The correct option is A $a$
Two sets are said to be equal if all of their elements are same.
$\Rightarrow A = B$
On comparison, we get $x = a$
Hence, if $x = a,$ then both the sets are equal.

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