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How many words, with or without meaning can be made from the letters of the word MONDAY, assuming that no letter is repeated, if 4 letters are used at a time

Q.9.    How many words, with or without meaning can be made from the letters of the
          word MONDAY, assuming that no letter is repeated, if.

         (i) 4 letters are used at a time

Answers (1)
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There are 6 letters in word MONDAY.

Therefore, words that can be formed using  4 letters of the word MONDAY.

Hence, the required number of words formed using 4 letters  =^6P_4

                                                                                            =\frac{6!}{(6-4)!}

                                                                                             =\frac{6!}{(2)!}

                                                                                             =\frac{6\times 5\times 4\times 3\times 2!}{(2)!}

                                                                                             =6\times 5\times 4\times 3

                                                                                              =360

 

 

 

 

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