Mathematics · May / June 2021 · Paper 21 · Question 17
0580
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The question as text
A bag contains 3 blue buttons, 8 white buttons and 5 red buttons. Two buttons are picked at random from the bag, without replacement. Work out the probability that the two buttons are either both red or both white. [3]
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19 60 oe [3]
M2 for 8 7 5 4 × + × 16 15 16 15
or M1 for 8 7 or 5 4 × × 16 15 16 15 If 0 scored
SC1 for 89 256 oe
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