CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2008

  • question_answer
    The number of four-letter words that can be formed (the words need not be meaningful) using the letters of the word MEDITERRANEAN such that the first letter is E and the last letter is R, is

    A)  \[\frac{11!}{2!2!2!}\]                    

    B)  \[59\]

    C)  \[56\]                  

    D)         \[\frac{11!}{3!2!2!}\]

    E)  \[\frac{11!}{3!3!2!}\]

    Correct Answer: B

    Solution :

    Word MEDITERRANEAN has\[2A,3E,ID,II,1M,\]\[2N,2R,IT\]. In out of four letter E and R is fixed and rest of the two letters can be chosen in following ways. Case I. Both letter are of same kind ie,\[^{3}{{C}_{2}}\] ways, therefore number of words                 \[{{=}^{3}}{{C}_{2}}\times \frac{2!}{2!}=3\] Case II. Both letters are of different kinds ie,\[^{8}{{C}_{2}}\]ways, therefore number of words \[{{=}^{8}}{{C}_{2}}\times 2!=56\] Hence, total number of words are\[56+3=59\]


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