Question

1.What's the sum of the first 50 positive integers?

2.If a, b, and c are consecutive integers such that a < b < c, which of the following must be true?

3.If a = (2x+1)/(x-1) and b = (x+1)/(2x-1), what is the value of (a+b)/(a-b)?

Answer 1

1. (50x51)/2 = 1275 using summations and formula of n(n+1)/2