Questions
How many different words can be formed by using all the letters o( the word 'ALLAHABAD' such that vowels occupy the even positions, is
detailed solution
Correct option is D
There are 4 vowels and all are alike i.e. 4A's. Also, there are 4 even places viz 2nd, 4th, 6th and 8th. So, these 4 even places can be occupied by 4 vowels in 4!4!=1 way. Now, we are left with 5 places in which 5 letters, of which two are alike (2 L's) and other distinct, can be arranged in 5!2! ways.Hence, the total number of words in which vowels occupy the even places =5!2!×4!4!=5!2!=60Similar Questions
The number of ways in which we can get at least 6 successive tails when a coin is tossed 10 times in a row, is
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