the number of three letter words which can be formed from the word PROPOSAL in which the middle letter is a vowel is how to make cases for this question help
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Originally Posted by prasum the number of three letter words which can be formed from the word PROPOSAL in which the middle letter is a vowel is how to make cases for this question help a) with letter repetition : $\displaystyle 2 \cdot 6^2 = 72$ b) without letter repetition : $\displaystyle 2 \cdot \frac{5!}{(5-2)!}=40$
40 words is not correct as I count. There are 11 sets of words beginning OA RA SA PA LA 00 RO SO PO LO AO.I count 22 words middle letter A and 31 words middle letter O
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