- #1
anemone
Gold Member
MHB
POTW Director
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Here is this week's POTW:
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Call a number $T$ persistent if the following holds:
Whenever $a,\,b,\,c,\,d$ are real numbers different from $0$ and $1$ such that
$a+b+c+d=T$ and $\dfrac{1}{a}+\dfrac{1}{b}+\dfrac{1}{c}+\dfrac{1}{d}=T$
we also have
$\dfrac{1}{1-a}+\dfrac{1}{1-b}+\dfrac{1}{1-c}+\dfrac{1}{1-d}=T$
Prove that $T$ must be equal to $2$ if $T$ is persistent.
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Remember to read the https://mathhelpboards.com/showthread.php?772-Problem-of-the-Week-%28POTW%29-Procedure-and-Guidelines to find out how to https://mathhelpboards.com/forms.php?do=form&fid=2!
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Call a number $T$ persistent if the following holds:
Whenever $a,\,b,\,c,\,d$ are real numbers different from $0$ and $1$ such that
$a+b+c+d=T$ and $\dfrac{1}{a}+\dfrac{1}{b}+\dfrac{1}{c}+\dfrac{1}{d}=T$
we also have
$\dfrac{1}{1-a}+\dfrac{1}{1-b}+\dfrac{1}{1-c}+\dfrac{1}{1-d}=T$
Prove that $T$ must be equal to $2$ if $T$ is persistent.
-----
Remember to read the https://mathhelpboards.com/showthread.php?772-Problem-of-the-Week-%28POTW%29-Procedure-and-Guidelines to find out how to https://mathhelpboards.com/forms.php?do=form&fid=2!