A-LevelMathematicsProbability and statistics9709/62 · Feb/Mar 2018 · Q24 Marks
A selection of 3 letters from the 8 letters of the word COLLIDER is made.
- (i)How many different selections of 3 letters can be made if there is exactly one L?[1]
- (ii)How many different selections of 3 letters can be made if there are no restrictions?[3]
Mark scheme
Marking points from the official mark scheme (Feb/Mar 2018). The mark or mark type is shown in brackets.
- [B1] 1 L: ⁶C₂ = 15
- [M1] Either 0L or 2L correct unsimplified
- [M1] Summing the 3 correct scenarios
- [A1]
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