Next, we are asked to consider the sum of the first n odd natural numbers. We are given in the quiz instructions that: The nth odd number is (2n-1) This is important to understand. Let's check this out. For example, if n= 3, then the nth odd number would be (2n-1) which is (2(3)-1) or (6-1) or 5. This agrees with our set, as the nth element when n=3 is the 3rd element, and the third element in the set {1, 3, 5} is 5. So, if n = 70, using this, the nth odd number would be (2n-1), which is [ Select ]