Which undefined geometric term can be described as a one-dimensional set of points that has no beginning or end?

Joanie watched 1 out of three of a movie in the morning

Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent.the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244

In his stamp album ,jamal has 48 new stamps and 72 used stamps. which ratio can be represented by 3/5