1.

Determine whether or not each of the definition of given below gives a binary operation. In the event that * is not a binary operation, give justification for this. (i) On Z+, define * by a * b = a − b (ii) On Z+, define * by a * b = ab (iii) On R, define * by a * b = ab2 (iv) On Z+, define * by a * b = |a − b| (v) On Z+, define * by a * b = a

Answer»

Determine
whether or not each of the definition of given below gives a binary
operation. In the event that * is not a binary operation, give
justification for this.



(i) On
Z+,
define * by a *
b =
a
b


(ii) On
Z+,
define *
by a *
b =
ab


(iii) On
R,
define *
by a *
b =
ab2


(iv) On
Z+,
define *
by a *
b =
|a
b|


(v) On
Z+,
define *
by a *
b =
a



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