Different string can be made from the letter of ORONO

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how many different string can be made from the letter of ORONO using some or all of letter???plese tell logic also..

Ravi Garg edited question
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    Dheeraj Kumar Choudhary (anonymous)

    for choosing 2 alike there is only 1 way. and for 2 different is 1*2! = 2 way. and when you take 1 alike and 1 diff then 2 ways for choosing 1 word from diff and 1 way for choosing alike. so 2*1*2! because they are both different now.

    Dheeraj Kumar Choudhary answered
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      Dheeraj Kumar Choudhary (anonymous)

      for three letter (6+6+1) = 13

      for four letter (12+8) = 20

      and for five letter 20

      so total of (3+7+13+20+20) = 63

      i hope it will help you.

      Dheeraj Kumar Choudhary answered
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        Sanjay Batra (anonymous)

        how did u find for 2 letter

        2 alike+2 diff ?

        Sanjay Batra answered
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          Dheeraj Kumar Choudhary (anonymous)

          yes

          Dheeraj Kumar Choudhary answered
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            Sanjay Batra (anonymous)

            then how 4,1,2

            Sanjay Batra answered
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