1.

If A = null set, then the no. of elements in `P(P(P(A)))` where `P(A)` denotes the power set of A is -A. 1B. 2C. 4D. 0

Answer» Correct Answer - C
`A = {} rArr P(A) = {phi}`
`P(P(A)) = {phi,{phi}}`
`P(P[P(phi)]) = {phi,{phi},{{phi}},{phi,{phi}}}`
so no. of elements is 4.


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