Question

a bag contains 8 red marbles 5 blue marbles 8 yellow marbles what is the probability of choosing a red marble if a single choice is made from the bag

Answer 1

$\frac{8}{21}$

8 + 8 + 5 = 21

$\frac{8}{21}$ = probability of getting a red marble

$\frac{8}{21}$  = probability of getting a yellow marble

$\frac{5}{21}$ = probability of getting a blue marble

Hope it helped,

BioTeacher101