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Ishaan94

  • 3 years ago

\[\mathsf{a,b,c \in \left[0,1\right]}\]\[\mathsf{\text{Prove}\quad\frac{a}{b+c+1} + \frac{b}{a+c+1} + \frac{c}{a+b+1} + \left(1-a\right)\left(1-b\right)\left(1-c\right)\le1}.\]

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  1. Ishaan94
    • 3 years ago
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    @mukushla @KingGeorge

  2. vishweshshrimali5
    • 3 years ago
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    \[\mathsf{\text{Prove}\quad\frac{a}{b+c+1} + \frac{b}{a+c+1} + \frac{c}{a+b+1} + \left(1-a\right)\left(1-b\right)\left(1-c\right)\le1}\] Because \[\mathsf{a,b,c \in \left[0,1\right]}\] It can be easily seen that for a,b,c = 0 or 1 the LHS becomes = 1 Now in all other remaining cases i.e. a,b,c belong to (0,1) each of the fraction will lie in (0,1/3) and each of (1-a), (1-b),(1-c) will lie between (0,1) and so (1-a)(1-b)(1-c) will be approx. = 0 and so the whole LHS < 1 I know that it is a very bad proof But it is just a try. Sorry for this bad attempt

  3. vishweshshrimali5
    • 3 years ago
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    (1-a)(1-b)(1-c) will be approx. = 0 this is because product of any three decimals <1 and > 0 their product will be very close to 0

  4. vishweshshrimali5
    • 3 years ago
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    @Ishaan94 Can this help u a little ............... ?

  5. mukushla
    • 3 years ago
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    another solution using calculus

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  6. Ishaan94
    • 3 years ago
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    thank you mukushla. i do like the solution, thanks a lot. and thank you vishwesh i had already thought of the way the you did but wasn't able to generate a concrete solution.

  7. vishweshshrimali5
    • 3 years ago
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    @mukushla It is really a very nice solution

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