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Question

The number of different words of three letters which can be formed from the word "PROPOSAL", if a vowel is always in the middle are-

  1. 53  
  2. 52  
  3. 63  
  4. 32  

The correct answer is: 53


    We have seen that the total number of positive integral solutions of abc = 24 is 30. We observe that any two of the factors in each factorization may be negative. Hence,
    Number of integral solutions= Number of positive integral solutions+ Number of integral solutions having two negative factors.
    Thus total number of solution is 120.
    C : If consonant is filled.
    2P, 1R, 1S, 1L, 2(O), 1A
    table row V V V end table fraction numerator table row 3 end table over denominator table row 2 end table end fraction
    table row V V C end table 4.1 + 4 table row 2 end table
    table row C V V end table 4.1 + 4 table row 2 end table
    table row C V C end table 1.2 + 6. table row 2 end table table row 2 end table
    -----------------
    Total 53

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