# Doubt

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## Doubt

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## Re: Doubt

 XY = X if Y=1      = -X if Y=-1. X/Y = X for any Y. Now the value of XY will depend on X/Y. If X/Y = x then XY = x or -x with equal probability.
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## Re: Doubt

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## Re: Doubt

 In reply to this post by Abhitesh But why X/Y is X ..I mean it's value should also be x or -x depending upon the value of Y.
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## Re: Doubt

 X|Y is the value of X given Y. The value of X doesn't depend on Y.
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## Re: Doubt

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## Re: Doubt

 In that case they would be equal.
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## Re: Doubt

 In reply to this post by Halflife I too think so. If it was X given by, it would have been enclosed in bracket. Other term is product, this one would be division!!!
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## Re: Doubt

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## Re: Doubt

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## Re: Doubt

 only if I assume X to be independent ....I'm able to solve the question otherwise this is getting complicated
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## Re: Doubt

 hey,as per what I read cov(x,y)=E(XY)-E(X)E(Y) and acc to this it will become E(XY.X/Y)-E(XY)*E(X/Y)
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## Re: Doubt

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