Answer:
.
Given * P (X) × P(X) defined
as
Let,
if possible, I be an identity elements in P(X).
Also
and I and
Thus,
X is the identity element.
2nd
Part : Let A be an invertible element of P(X).
there exist
an element
such that
A = X and B =
X.
is the only
invertible element in P(X) and
X?1
= X.
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