Set of notation *best answer ?

Question

Express the set in the notation {x:____}

{1,3,5,7,9...}

There are other question like this, but I will do those myself, so some one Please explain how will I solve this problems, to get me start on the others... THANK YOU

Answer 1

{1,3,5,7,9...}

{x:set of odd integers.}

Answer 2

{x: 2n - 1}, n >=1 and n is an element of the Integer set

Answer 3

x:add numbers then divide by how many numbers are there that is the answer

Answer 4

I'm guessing you're looking for a rule for the set:

{2n - 1}, where the nth term is found using the formula given (which happens to be the set of odd natural numbers)

in the formula, n is a positive integer showing the position of the term

edit: careful Pranil... it's only the odd natural numbers, not integers, which include negative numbers