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Q18: Question – Paper 2 – November 2018
Q18: Question – Paper 2 – November 2018
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Question
18)
A bag contains 20 discs.
10 are red, 7 are blue and 3 are green.
a) Marnie takes a disc at random before putting it back in the bag.
Nick then takes a disc at random before putting it back in the bag.
Olly then takes a disc at random.
Work out the probability that they all take a red disc.
A bag contains 20 discs.
10 are red, 7 are blue and 3 are green.
a) Marnie takes a disc at random before putting it back in the bag.
Nick then takes a disc at random before putting it back in the bag.
Olly then takes a disc at random.
Work out the probability that they all take a red disc.
[2 marks]
b)
All 20 discs are in the bag.
Work out the probability that all three discs are different colours.
All 20 discs are in the bag.
- Reggie takes three discs at random, one after the other.
- After he takes a disc he does not put it back in the bag. Reggie’s first disc is blue.
Work out the probability that all three discs are different colours.
[3 marks]