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Q.

The number of 5 letter words that can be formed using the letters of the word DELHI which begin and end with an vowel when repetitions are allowed is

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21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

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a

625

b

1350

c

125

d

500

answer is C.

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Detailed Solution

End places can be filled in _{$2^{2} (E, I)$} ways the remaining 3 places can be filled in _$5^{3}$ ways _{$= 2^{2} \times 5^{3} = 500$}

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