Question 1195966: 2. If the permutation of the word WHITE is selected at random, how many of the permutations
i. Begins with a consonant?
ii. Ends with a vowel?
iii. Has a consonant and vowels alternating?
Answer by ikleyn(52754) (Show Source):
You can put this solution on YOUR website! .
If the permutation of the word WHITE is selected at random, how many of the permutations
i. Begins with a consonant?
ii. Ends with a vowel?
iii. Has a consonant and vowels alternating?
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(i) The total number of permutations of the letters W,H,I,T,E is 5! = 5*4*3*2*1 = 120.
Of them, the number of permutations starting with the consonant W is 4! = 4*3*2*1 = 24;
the number of permutations starting with the consonant H is another 4! = 4*3*2*1 = 24;
the number of permutations starting with the consonant T is another 4! = 4*3*2*1 = 24.
The total number of permutations starting with the consonant is 3*24 = 72. ANSWER
(ii) Similar reasoning with the last letters gives the number of permutations for question (ii) 2*24 = 48. ANSWER
(iii) For alternating locations, we have these permutations CVCVC, where C is a place holder
for any of the three consonants and V is a place holder for any of the two participating vowels.
So, the number of the alternate permutations is 3!*2! = 6*2 = 12. ANSWER
Solved.
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