Question

A bag has 80 marbles if 25 are red marbles 35 are yellow and rest of them are black, then find probability
of a black marble
or green marble
and non red marble
​

Answer 1

Explanation:

Total no. of marbles= 80

No. of red marbles= 25

No. of yellow marbles= 35

No. of black marbles= 80 - (25+35)

= 80 - 60

= 20

P(E) = no. of favourable outcomes/ total no. of outcomes

P(black marble) = 20/80

= 1/4

P(green marble) = 0/80

= 0

No. of non red marble= 80 - 25

= 55

P(non red marble) = 55/80

Answer 2

1. The probability of getting a black or green marble is = 1/4
2. The probability of getting a non-red marble is = 11/16

Given:

A bag has a total of 80 marbles(red, yellow, and black marbles)

In which

• The number of red marbles is = 25
• The number of yellow marbles is = 35
• The number of black marbles is = the rest marbles which are remaining. = 80 - (25 + 35)  = 80 - 60 = 20

To find:

Probability of a black marble  or green marble and non red marble

• Black marble or a green marble = 20 (Number of favorable outcomes) and there are no green marbles in the bag(so the number of green marbles = 0)

P(getting black marbles) = 20/80 = 1/4

• Non-red marble (i.e. means all balls except red one) = total marbles - number of red marbles = 80 - 25 = 55 non-red marbles

P(getting non-red marbles) = 55/80 = 11/16