O-LevelAdditional MathematicsPermutations and combinationsMay/June 2021Paper 1 Q69 Marks
(a) (i) Find how many different 5-digit numbers can be formed using the digits 1, 3, 5, 6, 8 and 9. No digit may be used more than once in any 5-digit number. (ii) How many of these 5-digit numbers are odd? (iii) How many of these 5-digit numbers are odd and greater than 60000? (b) Given that 45×"C4 = (n + 1)x"+1C5, find the value of n.
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