O-LevelMathematicsProbability4024/12 · May/June 2019 · Q174 Marks
Nima has these six cards. Each card has a shape on it. [Figure showing 4 circles and 2 triangles] She takes two cards at random without replacement.
- (a)Complete the tree diagram. [Figure incomplete tree diagram][2]
- (b)Find the probability that the shapes on Nima's two cards are the same. Give your answer as a fraction.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [B1] (a) 2/6 on first branch
- [B1] 2/5, 4/5, 1/5 on second set
- [2] (b) 14/30 oe
- [M1] for 4/6 x 3/5 + 2/6 x 1/5 oe or their- x their- oe
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