Question

An eight sided die is tossed . determine the odds against rolling a 3

Answer 1

the odds would be 1/8  ( one number 3 and 8 sides)

Answer 2

Eight sides. You are trying to find the odds of rolling one side, or 3. 

That is 1/8 of a chance of rolling a 3 on an eight-sided die. 

Or, 12.5%.

I hope this helps!
~kaikers