Ten different letters of an alphabet are given. Words with 5 letters are formed from these given letters. Find the no. of words which have at least one letter repeated?

• Total no. of words possible-no of words with no letter repitation:
  for 5 letter words:
  (10*10*10*10*10)-(10*9*8*7*6)
  =69760
• 11 years agoHelpfull: Yes(46) No(4)
• Number of words which have at least one letter replaced:
  = Total number of words - total number of words in which no letter is repeated
  ⇒10^5–16P5
  ⇒100000−30240= 69760
• 11 years agoHelpfull: Yes(8) No(8)
• 10^5 -10*9*8*7*6*5
• 11 years agoHelpfull: Yes(7) No(3)
• no. of words with repetition: 10^5
  no. of words without repetition: (5!*10!)/(5!*5!)
  ans: 10^5-(5!*10!)/(5!*5!)
  =69760
• 11 years agoHelpfull: Yes(3) No(0)
• ans is:10^5-10*9*8*7*6
• 11 years agoHelpfull: Yes(2) No(0)
• 10^5 - 10*9*8*7*6 = 69760
• 11 years agoHelpfull: Yes(2) No(1)
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• 11 years agoHelpfull: Yes(1) No(7)