The number of 5 letters palindrome words that can be formed only using vowels is
A
25
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B
250
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C
125
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D
24
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Solution
The correct option is C125 Let the palindrome word is A1A2A3A2A1, then A1 can be filled in 5 ways (a,e,i,o,u),
similarly A2 can be filled in 5 ways,
similarly A3 can be filled in 5 ways, ∴total number of palindrome words =5×5×5=125