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Math Help - 3 Xor expressions

  1. #1
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    3 Xor expressions

    Let + is XOR
    Code:
    b + X = d
    c + P = e
    d + e = M
    Is it possible to get back b if M, X, P is Given ??
    if thats not possible is it possible if c is also Given . b is not possible to Be given.
    If possible please tell teh expression. and I think its possible.
    And please first try to solve if c is not given .
    Thanks .
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  2. #2
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    Just making the subs, if M,X,c,P are given you have:

    b=M-X-c-P
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  3. #3
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    Ya I got that But trying to get that without C But no way still now
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  4. #4
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    Quote Originally Posted by neel_basu View Post
    Let + is XOR
    Code:
    b + X = d
    c + P = e
    d + e = M
    Is it possible to get back b if M, X, P is Given ??
    if thats not possible is it possible if c is also Given . b is not possible to Be given.
    If possible please tell teh expression. and I think its possible.
    And please first try to solve if c is not given .
    Thanks .
    It is not possible in general to find b given M, X and P. To show this let M, X, P all be 0. Then b=d=c=e, but they can be either 1 or 0.

    If c is given then

    b+X=d=M+e=M+c+P

    so:

    b=M+c+P+X.

    RonL
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  5. #5
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    I think (I am not in touch of Maths for 2 years [I might be wrong])
    m = d Xor e [m is given]
    d = b Xor X
    here to get the value of b we need to substitute d with b Xor X
    and as e is not given we must substitute
    but only relation of e is given is e = c Xor P
    and that relates with c
    we cant get rid of c .
    I thought about another way also by Xoring e with c
    So e Xor c = c Xor c Xor P but its not possible cause there is no other relations (only one relation) that relates with c.
    So I thing Its not possible.
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  6. #6
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    Thanks I've got it.
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