Let A = N × N and * be the binary operation on A defined by (a, b) * (c, = (a + c, b + d). Then * is
A. commutative
B. associative
C. Both (a) and (b)
D. None of these
Answer:C
Let A = N × N and * be the binary operation on A defined by (a, b) * (c, = (a + c, b + d). Then * is
A. commutative B. associative C. Both (a) and (b) D. None of these