raeann105 wrote:
VeritasPrepKarishma wrote:
Now you have 4 numbers/groups to arrange which can be done in 4! ways.
VeritasPrepKarishma can you please explain how you draw the conclusion that there are 4 numbers/groups to arrange? There are only 2 numbers and the second part of your answer addresses switching their order. I am not understanding this conclusion. Thank you!
You need to create a 5 digit integer using digits from 1 to 5. You will do that in various ways such as 12345, 23145, 45231 etc
If you club 3 and 4 together, you get a group {34}.
Now you have 3 leftover digits: 1, 2 and 5.
You have arrange 1, 2, 5 and {34}. So you have to arrange 4 digits/groups.
You can do this in various ways such as 12534, 21345 etc...
Since instead of {34}, you can have {43} too, you multiply by 2.
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Karishma
Veritas Prep GMAT Instructor
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