Hi guys. I'm new to this site. I need help answering the following math problem:?

Question

Determine whether each of these functions from Z to Z is one-to-one.
(a) f(n)=n-1
(b) f(n)=n^2+1
(c) f(n)= n^3
(d) f(n)= [n/2]

Answer 1

Just a warning - you have to post an actual question in the subject line or it will be deleted. Perhaps you should have written "Can you help me with the following math problem?" Check the community guidelines or you'll end up losing points.

Answer 2

No, I don't think any of them would equal 121 except when n is a certain fixed value.