Question

There are 5 blue beds and 7 black beds in a box. if one bed is taken without looking.

A) What is the probability of getting a blue bed?

B)What is the probability of a black bed?

Answer 1

No. of all possible outcomes = 5blue + 7black

n(S) = 13 beds

A) Let P(A) be the probability that the bed taken out was of blue colour.

> No. of outcomes favourable to A [n(a)] = 5

Therefore,

P(A) = n(a) / n(S) = 5 / 13

B) Let P(B) be the probability that the bed taken out was of black colour.

> No. of outcomes favourable to B [n(b)] = 7

Therefore,

P(A) = n(b) / n(S) = 7 / 13

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