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  4. If A = x: x2 = 16 and B = x: x4 = 256 then A Δ B is equal to

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Q. If $A = \{x : x^2 = 16\}$ and $B = \{x : x^4 = 256\}$, then $A \Delta B$ is equal to

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Solution:

Correct answer is (a) $\{- 4i, 4i\}$