permutation and combination!!!!!!!!!!
Probability
Level
pending
How many words can be formed out of the letters of the word ARTICLE so that the vowels occupy even places?????
4!5!
2!3!
5!6!
3!4!
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1 solution
The word "ARTICLE" has 3 even places such as 2,4,6 and there are 3 vowel such as A,I,E.So the permutation for this 3 places will be 3!.
On the other hand the permutation for the other 4 places(1,3,5,7) has 4 consonant such as R,T,C,L.So the permutation for this 4 places will be 4!
So the answer will be 3!*4!