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if A={0,ø,{ø}}, then find total number of elements in {P(P(A))}.what is meant by set { }, set ø and set {ø}find number of elements in set A{x : x =ø, {ø}, { } }question number 2 please

$\left(1\right)\left[-2,2\right]\phantom{\rule{0ex}{0ex}}\left(2\right)\left[0,4\right]\phantom{\rule{0ex}{0ex}}\left(3\right)\left(1,3\right)\phantom{\rule{0ex}{0ex}}\left(4\right)Noneofthese$