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String manipulation

mustish1 asked
Last Modified: 2012-05-12
From a seven letter word by mixing up the letters in the word COMBINE.

a. How may ways can you do this if all the vowels have to be at the beginning?
I dont understand that
Ans. 144

b. How may ways can you do this if no vowel is isolated between two consonants?
I dont get that one either

Needs help. Thanks.
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