Question
Find the number of permutations of the letters of the words FORECAST and MILKEY, taking 5 at a time so that 3 letters can be chosen from the first word and 2 letters from the second word.
Step 1
There are 8 letters in FORECAST, so we can choose 3 of them in 8C3 ways, which is: 8C3 = 8! / (3! * (8-3)!) = 8! / (3! * 5!) = 56 ways. Show more…
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