A box contains identical balls of which 12 are red, 18 white and 8 blue. Three balls are drawn from the box one after the other without replacement. Find the probability that;

(a) three are red
(b)the first is blue and the other two are red.

(c)two are white and one is blue.

Step-by-step explanation:

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option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have