Question

1)Thereare3red,3whiteand3greenmarblesinapouch.

Onemarbleistakenoutrandomly.Whatistheprobability

inthefollowingcases,whenthemarbledrawnis:

(i)red

(ii)not red

(iii)either red or white
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Answer 1

Answer:

(i)

$3 \: red \: marbles \: are \: there \\ all \: together \: 3 + 3 + 3 = 9 \\ probability \: = \frac{3}{9} = (by \: cancellation) = \frac{1}{3}$

(ii)

$there \: are \: 6 \: non \: red \: marbles \\ probability = \frac{6}{9} = \frac{2}{3}$

(iii)

$there \: are \: 3 \: white \: and \: red \: marbles \: \\ total \: 6 \: marbles \\ probability \: = \frac{6}{9} = \frac{2}{3}$

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Answer 2

Answer:

1) 1/3

2) 2/3

3) 2/3

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