carefreekaran

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About carefreekaran

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  1. carefreekaran added an answer to a question Unique Codes   

    Total cases = 10!.
    Considering case when one block( 3 digits) is same as 1st code sequence= 8!..
    Multiply by 2 because 3 digits can be reversed in a block and they'll still be adjacent..
    Total blocks= 8. Hence total cases=8*2*8!..
    [Above expression also contains cases when more than 3 digits are same w.r.t 1st code..]
    Therefore ans= 10!-(2*8*8!)
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