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S1 Question
There is a lottery where each ticket has 5 different letters printed on it (So there are 65780 tickets in total).
Tickets which match 3 numbers win £10.
Find the number of tickets which win £10.
I thought it would be 5C3 (For the three you match) x 21 (number of possible letters for letter #4) x 20 (number of possible letters for letter #5) = 4200.
Apparently the answer is 2100, what did I do wrong?
Tickets which match 3 numbers win £10.
Find the number of tickets which win £10.
I thought it would be 5C3 (For the three you match) x 21 (number of possible letters for letter #4) x 20 (number of possible letters for letter #5) = 4200.
Apparently the answer is 2100, what did I do wrong?
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