When A = Φ, then the number of elements in P(P(A)) is ____________
Given:
\[ A = \Phi \]
Since the empty set has no elements,
\[ n(A)=0 \]
Therefore,
\[ n(P(A)) = 2^0 = 1 \]
Now, \(P(A)\) has 1 element. So the number of elements in \(P(P(A))\) is:
\[ n(P(P(A))) = 2^1 = 2 \]
Answer
\[ \boxed{2} \]