Question

A marble is drawn from a box containing 10 red 30 white 20 blue and 15
Orange marbles. Find the probability that it is
i) Orange or Red
ii) Not Red or Orange

Answer 1

Explanation:

Total number of balls in the box, n(S)=10+30+20+15=75

Number of orange balls,15

Number of red balls, 10

Hence the number of favourable outcomes for getting a red or orange ball is, n(E)=15+10=25

Hence the probability of a ball drawn is red or orange is,

n(S)

n(E)

=

75

25

=

3

1

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