Answer:
Step-by-step explanation:
Given that *is the binary operation in the sets of integers.

closure: a-b+ab is again an integer belongs to Z. Hence closure is true.
Associativity: 

The two are not equal. Hence this cannot be a group as associtiavity does not hold good.
Answer:
6^{4} · 4^{4} · b^{3}
Step-by-step explanation:
Collect identical number terms to get the exponent:
6.4⋅6.4⋅6.4⋅6.4⋅b⋅b⋅b
As you can see, there are four "6s", four "4s" and three "b"s
So we got the conclusion the answer is just 6^{4} · 4^{4} · b^{3}
Answer:
A
Step-by-step explanation:
Answer:
sdfghhhj
Step-by-step explanation:
ther is no qustions