Question

a bag contains 6 red and some black balls if the ratio of the probability of drawing a red ball to the black ball is 3 ratio 4.. 1)find the number of black balls.2)the probability of drawing either a red ball or black ball​

Answer 1

1) 3/4= 6/black balls

black balls = 8

2)1

Answer 2

1).
Let total number of Black balls be "x"
P(R) → Probability of Red balls
P(B) → Probability of Black balls
6 R | x B → 6 Red & x Black balls

Total Black balls is equal to 8.
x = 8


2). Probability of drawing Red or Black ball
= (6+x)/(6+x)
= 1