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An urn contains 25 balls of which 10 balls are red and the remaining green. A ball is drawn at…
An urn contains 25 balls of which 10 balls are red and the remaining green. A ball is drawn at random from the urn, the colour is noted and the ball is replaced. If 6 balls are drawn in this way, find the probability that:
(i)
All the balls are red.
(ii)
Not more than 2 balls are green.
(iii)
Number of red balls and green balls are equal.
Answer
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From ISC 2017 Mathematics Paper 1, question 12(b).