Ten different letters of an alphabet are given. Words with five letters are formed from these given letters. Then the number of words which have at least one letter repeated is [IIT 1980; MNR 1998, 99; DCE 2001]

Ten different letters of an alphabet are given. Words with five letter

1.	Ten different letters of an alphabet are given. Words with five letters are formed from these given letters. Then the number of words which have at least one letter repeated is [IIT 1980; MNR 1998, 99; DCE 2001]
A.	69760
B.	30240
C.	99748
D.	None of these
Answer» B. 30240

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Ten different letters of an alphabet are given. Words with five letters are formed from these given letters. Then the number of words which have at least one letter repeated is [IIT 1980; MNR 1998, 99; DCE 2001]

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