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The number of words of four letters containing equal number of vowels and consonants, where repetition is allowed, is
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a
1052
b
210 x 243
c
105 x 243
d
150 x 212
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Correct option is D
Let us first select two places for vowel, which can be selected from 4 places in 4C2, ways. Now this places can be filled by constants in 21 x 21 ways as repetition is allowed. The remaining two places can be filled by consonants in 4C2×25×212=150×212.Similar Questions
is equal to
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