Management Aptitude Test 2016 Paper

Question : 85 of 200

Marks: +1, -0

10 different letters of English alphabet are given. A word is formed using 5 letters out of these. The probability that atleast one letter is repeated in the word, i s _____ .

$1/56$
$10^5 - ^10P_5$
$2/5$
None of these

Validate

Solution:

(b) Number of words which have one letter repeated!

\;\;\;\;\;

= Total number of words - Total number of words in which no letter is repeated

\;\;\;\;\;= 10^5 - ^10P_5

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