Consider the following statements. S1: f(x) = x5 + 3x - 1 is an increasing function for all values of x. S2: f(x) = 1-x3-x9 is decreasing function for all values of x where x 0. Which of the above statements are TRUE. A-S1 only B-S2 only C-Both S1 and S2 D-Neither S1 nor S2

I was reading cumulative distribution function from sheldon ross and I had a doubt regarding one of it's properties. The following are properties of the cumulative distribution function for a random variable X (1)F is a non-decreasing function, if $a\leq b$ ... to b, $lim_{n\rightarrow \infty}F(b_n)=F(b)$ What does this $4^{th}$ property actually mean can anyone explain?