Mathematics, 04.12.2021 01:20 makenziemartinez

There are three £1 coins and nine 50p coins. She takes 3 coins from the bag at random.

work out the probability that she takes exactly £2.50

so i know the answer is 27/220 but i do not know how you guys got to 220 can someone give me the calculation. not just "12c3= 220" cause i dont get it

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There are three £1 coins and nine 50p coins. She takes 3 coins from the bag at random.

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