10 different letters of an alphabet are given. Words with 5 letters are formed from these given letters then the numbers of words which have atleast one letter represent is:

10 different letters of an alphabet are given. Words with 5 letters ar

1.	10 different letters of an alphabet are given. Words with 5 letters are formed from these given letters then the numbers of words which have atleast one letter represent is:
Answer» Total possible ways=`10^5` Atleast one letter repeat=total number of letter repeat `=10^5-.^10C_55!` `=100000-(1098765!)/(5!5!)*5!` `=100000-30240` `=169760` Option 1 is correct.

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10 different letters of an alphabet are given. Words with 5 letters are formed from these given letters then the numbers of words which have atleast one letter represent is:

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