If two letters are taken at random from the word DREAM, what is the probability that none of the let

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26 Sep 2018 Probability

If two letters are taken at random from the word DREAM, what is the probability that none of the letters would be vowels?

OPtion

1) 2/5
2) 3/5
3) 1/2
4) 1/6
5) 1/3
6) 1/12
7) 3/10
8) 2/3
9) 5/12
10) None of these

Solution

P(first letter is not vowel) = 3/5

P(second letter is not vowel) = 2/4 = 1/2

So, probability that none of letters would be vowels is = (3/5)×(1/2)=3/10

Correct Option: 7 Best Solution (6)