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Maths
9. Combinations
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Q13 of 68 Page 347

Three persons enter a railway compartment having 5 vacant seats. In how many ways can they seat themselves?

Three persons enter a compartment where 5 seats are vacant. The number of ways they can be seated is = 5P3 = 60.


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11

How many words are formed by 2 vowels and 3 consonants, taken from 4 vowels and 5 consonants?

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Questions · 68
9. Combinations
1 1 1 1 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 1 2 3 4 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
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