7. In how many ways can the letters of the word "EQUATION" be arranged so that the consonants may occupy only odd positions?
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- How many distinguishable words can be formed from the letters of the word casserole if each letter is used exactly once?How many ways can a committee of 3 freshmen and 4 juniors be formed from a group of 8 freshmen and 11 juniors?In how many ways can 10 teenagers be seated at a round table if 2 girls wish to sit with their boyfriends.