writing probability function mathematically (in the shape of $f(x)$}…}












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$begingroup$


I am trying to write the following expression mathematically: let $X_1,X_2$ be independent random variables, each having the probability function $P_X(k)=p(1-p)^k$ for k=0,1,... and $0<p<1$.



Is it something like $forall X_1X_2 exists p_X(k)=p(1-p)^k|(k=0,1,2,..) land (0<p<1)$ ?



I would appreciate a correction and explanation, so I could not repeat the same mistake in the future.



Note: I did not define what is an independent random variable there; I just gave a general expression for random variables $X_1,X_2$. If you could, I would appreciate seeing how to write it with the definition of independence.



Thank you very much!










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$endgroup$












  • $begingroup$
    $X_1$ and $X_2$ are "fixed"; if so, we cannot quantify them.
    $endgroup$
    – Mauro ALLEGRANZA
    Jan 28 at 14:40






  • 1




    $begingroup$
    $P_X(k)$ must be (I think) $P_{X_i}(k)$ for $i=1,2$.
    $endgroup$
    – Mauro ALLEGRANZA
    Jan 28 at 14:40
















0












$begingroup$


I am trying to write the following expression mathematically: let $X_1,X_2$ be independent random variables, each having the probability function $P_X(k)=p(1-p)^k$ for k=0,1,... and $0<p<1$.



Is it something like $forall X_1X_2 exists p_X(k)=p(1-p)^k|(k=0,1,2,..) land (0<p<1)$ ?



I would appreciate a correction and explanation, so I could not repeat the same mistake in the future.



Note: I did not define what is an independent random variable there; I just gave a general expression for random variables $X_1,X_2$. If you could, I would appreciate seeing how to write it with the definition of independence.



Thank you very much!










share|cite|improve this question











$endgroup$












  • $begingroup$
    $X_1$ and $X_2$ are "fixed"; if so, we cannot quantify them.
    $endgroup$
    – Mauro ALLEGRANZA
    Jan 28 at 14:40






  • 1




    $begingroup$
    $P_X(k)$ must be (I think) $P_{X_i}(k)$ for $i=1,2$.
    $endgroup$
    – Mauro ALLEGRANZA
    Jan 28 at 14:40














0












0








0





$begingroup$


I am trying to write the following expression mathematically: let $X_1,X_2$ be independent random variables, each having the probability function $P_X(k)=p(1-p)^k$ for k=0,1,... and $0<p<1$.



Is it something like $forall X_1X_2 exists p_X(k)=p(1-p)^k|(k=0,1,2,..) land (0<p<1)$ ?



I would appreciate a correction and explanation, so I could not repeat the same mistake in the future.



Note: I did not define what is an independent random variable there; I just gave a general expression for random variables $X_1,X_2$. If you could, I would appreciate seeing how to write it with the definition of independence.



Thank you very much!










share|cite|improve this question











$endgroup$




I am trying to write the following expression mathematically: let $X_1,X_2$ be independent random variables, each having the probability function $P_X(k)=p(1-p)^k$ for k=0,1,... and $0<p<1$.



Is it something like $forall X_1X_2 exists p_X(k)=p(1-p)^k|(k=0,1,2,..) land (0<p<1)$ ?



I would appreciate a correction and explanation, so I could not repeat the same mistake in the future.



Note: I did not define what is an independent random variable there; I just gave a general expression for random variables $X_1,X_2$. If you could, I would appreciate seeing how to write it with the definition of independence.



Thank you very much!







probability-theory logic conditional-probability






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share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited Jan 28 at 16:07









J. W. Tanner

4,0171320




4,0171320










asked Jan 28 at 14:34









q123q123

75




75












  • $begingroup$
    $X_1$ and $X_2$ are "fixed"; if so, we cannot quantify them.
    $endgroup$
    – Mauro ALLEGRANZA
    Jan 28 at 14:40






  • 1




    $begingroup$
    $P_X(k)$ must be (I think) $P_{X_i}(k)$ for $i=1,2$.
    $endgroup$
    – Mauro ALLEGRANZA
    Jan 28 at 14:40


















  • $begingroup$
    $X_1$ and $X_2$ are "fixed"; if so, we cannot quantify them.
    $endgroup$
    – Mauro ALLEGRANZA
    Jan 28 at 14:40






  • 1




    $begingroup$
    $P_X(k)$ must be (I think) $P_{X_i}(k)$ for $i=1,2$.
    $endgroup$
    – Mauro ALLEGRANZA
    Jan 28 at 14:40
















$begingroup$
$X_1$ and $X_2$ are "fixed"; if so, we cannot quantify them.
$endgroup$
– Mauro ALLEGRANZA
Jan 28 at 14:40




$begingroup$
$X_1$ and $X_2$ are "fixed"; if so, we cannot quantify them.
$endgroup$
– Mauro ALLEGRANZA
Jan 28 at 14:40




1




1




$begingroup$
$P_X(k)$ must be (I think) $P_{X_i}(k)$ for $i=1,2$.
$endgroup$
– Mauro ALLEGRANZA
Jan 28 at 14:40




$begingroup$
$P_X(k)$ must be (I think) $P_{X_i}(k)$ for $i=1,2$.
$endgroup$
– Mauro ALLEGRANZA
Jan 28 at 14:40










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