2026 IGCSE Additional Mathematics May/June 0606/13 Q7

2026 IGCSE Additional Mathematics May/June 0606/13 Q7

4 marks

The number of combinations of \(r\) objects out of 20 objects is \(\dfrac43\) times the number of combinations of \(r+1\) objects out of 20 objects.

Find the value of \(r\).[4]

Solution:

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Answer:\(r=11\)

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