BDSunDevil wrote:
Can someone check for 4 and 5: i keep getting
4: 5!*6p3=2400
5. 720*4=2880
4) All the vowels are never together.
This is equivalent to (All possibilities - All the vowels are ALWAYS together) = 8! - 6!3!
5) Vowels occupy the even positions.
let us consider the following: first 3 vowels placing together in even positions:
-O-U-E--
-O---U-E
---O-U-E
Like this, at any point in time we have 4 positions to fill with 3 letters. Hence no. of ways will be 4P3 = 4!
Remaining 5 positions can be filled by 5!
Hence total ways = 4! x 5!
Hope this is clear. (if you like, give me kudos, please
)
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-Aravind Chembeti