How many elements has P(A), if A={}

1.	How many elements has P(A), if A={}
Answer» X + iy = ( a^2 + 1)^2/2a - i, find x^2+ y^2<br>0 elements<br>(null)<br>0<br>We know that if A is a set with m elements i.e.,\xa0n(A)=m,\xa0then,\xa0n[P(A)]=2m.If\xa0A={} =ϕ, then\xa0n(A)=0∴n[P(A)]=2o=1Hence, P(A) has one element.

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