Which series represents this situation? 1 + 1 • 7 + 1 • 7² +... 1 • 7⁶
1 + 1 • 7 + 1 • 7² +... 1 • 7⁷
7 + 1 • 7 + 1 • 7² +... 1 • 7⁶
7 + 1 • 7 + 1 • 7² +... 1• 7⁷

Meg constructed triangle poq and then used a compass and straightedge to accurately construct line segment os, as shown in the figure below, which could be the measures of angles pos and angle poq?

Let x have probability generating function gx (s) and let un generating function u(s) of the sequence uo, u1, satisfies p(x > n). show that the (1- s)u(s) = 1 - gx(s), whenever the series defining these generating functions converge.

Type the correct answer in the box. use numerals instead of words. if necessary use / for the fraction bar.