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Re: In how many different ways can the letters of the word [#permalink]

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23 Sep 2014, 04:58

Bunuel wrote:

usre123 wrote:

In how many different ways can the letters of the word 'DETAIL' be arranged such that the vowels must occupy only the odd positions?

A. None of these

B. 64

C. 120

D. 36

E. 360

OEOEOE

3 vowels EOI can be arranged on odd places in 3!=6 ways. Similarly 3 consonants can be arranged on even places in 3!=6 ways.

Total = 6*6 = 36.

Answer: D.

P.S. This question cannot be from any reliable GMAT source. Please do not post questions from that source again. Thank you.

Ok, I won't, thank you. But could you pls explain why we don't consider the one odd position after the 6th even one? just like we did in the link I posted in my answer above? You can delete this questions if you wish. I don't wan to confuse the other people preparing for the exam.

In how many different ways can the letters of the word 'DETAIL' be arranged such that the vowels must occupy only the odd positions?

A. None of these

B. 64

C. 120

D. 36

E. 360

OEOEOE

3 vowels EOI can be arranged on odd places in 3!=6 ways. Similarly 3 consonants can be arranged on even places in 3!=6 ways.

Total = 6*6 = 36.

Answer: D.

P.S. This question cannot be from any reliable GMAT source. Please do not post questions from that source again. Thank you.

Ok, I won't, thank you. But could you pls explain why we don't consider the one odd position after the 6th even one? just like we did in the link I posted in my answer above? You can delete this questions if you wish. I don't wan to confuse the other people preparing for the exam.

We have 6 letters, so only 6 places. There is no 7th place.
_________________

Re: In how many different ways can the letters of the word [#permalink]

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23 Sep 2014, 10:35

OEOEOE

3 vowels EOI can be arranged on odd places in 3!=6 ways. Similarly 3 consonants can be arranged on even places in 3!=6 ways.

Total = 6*6 = 36.

Answer: D.

P.S. This question cannot be from any reliable GMAT source. Please do not post questions from that source again. Thank you.[/quote]

Ok, I won't, thank you. But could you pls explain why we don't consider the one odd position after the 6th even one? just like we did in the link I posted in my answer above? You can delete this questions if you wish. I don't wan to confuse the other people preparing for the exam.[/quote]

We have 6 letters, so only 6 places. There is no 7th place.[/quote]

yes, but when we did the corporation eg, we put a place before and after the entire word (7 places fro 5 vowels). why cant we do the same here?

I'm really weak at this, is there is a gmat club book I could buy instead of annoying everyone (esp Bunuel) here?

In how many different ways can the letters of the word [#permalink]

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30 Sep 2014, 15:50

1

This post received KUDOS

usre123 wrote:

yes, but when we did the corporation eg, we put a place before and after the entire word (7 places fro 5 vowels). why cant we do the same here?

I'm really weak at this, is there is a gmat club book I could buy instead of annoying everyone (esp Bunuel) here?

The question states that the vowel letters must occupy the odd positions. If you place a vowel in the "7th place" that you are thinking of, then the placement of all letters will shift by one and every vowel will now be in an even position.

Re: In how many different ways can the letters of the word [#permalink]

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29 May 2017, 23:34

I am agree with answer but I have doubt. if option 729 is available additionally than is it possible to consider here repeatation? Means why answer is not 3*3*3*3*3*3=729 . three vowels can be arranged on first place ..3 consonants on second ..again 3 vowels on third place..and so in.

In how many different ways can the letters of the word 'DETAIL' be arranged such that the vowels must occupy only the odd positions?

A. None of these

B. 64

C. 120

D. 36

E. 360

Since detail has 6 letters, there are 3 odd positions, the 1st, 3rd, and 5th spots. Let’s determine how many ways the word can be arranged when the vowels occupy the odd positions.

1st spot: 3 options (any of the 3 vowels)

2nd spot: 3 options (any of the 3 consonants)

3rd spot: 2 options (any of the 2 remaining vowels)

4th spot: 2 options (any of the 2 remaining consonants)

5th spot: 1 option (the last remaining vowel)

6th spot: 1 option (the last remaining consonant)

So, the word can be arranged in 3 x 3 x 2 x 2 x 1 x 1 = 36 ways.

Answer: D
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