A teacher has 3 shirts. There are 25 students. T-shirt’s packages come in packs of 6. How many packages does the teacher need
1 answer:
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Answer:
1. No.
Since f(1)=f(3) and then f isn't one-to-one.
2. No
Since f(0)=f(2) and then f isn't one-to-one.
3. No
Since f(0)=f(2) and then f isn't one-to-one.
4. Yes
Since , then f is one-to-one
5. Since f(1)=f(3) and then, f isn't one-to-one
