Answer:
Let
a, b and c be three element of N
commutative.
Also
(a * b) * c = (a2 + b3) * c
=
(a3 + b3)3 + c3
and
a * (b * c) = a* (b2 + c3)
=
a3 + (b3 + c3)3
(a *b) *
not
associative
is correct.
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