Question

set A contains all the odd numbers from 1 to n,inclusive.if n is odd,what is the probability that a number selected at random from the set A is an odd number

Answer 1

question is not clearly and precisely formed.


if the set A contains only  odd numbers,  then the probability is 1, that a number selected at random from set A is odd.

if the set A contains all odd numbers from 1 to n,  and also some other odd or even numbers, then it  depends on how many other numbers are also present in set A.
This information is not clearly specified.