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Question

How many 4 letter words can be formed from the letters of the word ANSWER? How many of the words start with a vowel?

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Solution

ANSWER
Case:1 Starts with A
5 Letters and 3 Blanks
Number of ways =5C3=5×42=10 Ways
Case: 2 starts with E
5 Letters and 3 blanks
Number of ways =5C3=5×42=10 Ways
Hence total ways are 20

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