Question

If probability of getting a blue marble is 1/5 and of black is 1/4 if green marbles are 11 find total number of marbles

Answer 1

Answer:

Step-by-step explanation:

Answer 2

let total no. of marbles =x

Probability of bule marble P(B)=1/5

Probability of black marbleP(B')=1/4

sum of probabilities of an experiment =1

Probability of green marbleP(G)=?

P(B)+P(B')+P(G)=1

P(G)=1-1/5-1/4=11/20

P(G)=11/x

so,x=20

total number of marbles=20

no. of bule marbles=4

no. of black marbles =5