ISI 2007 ME-I - Doubts

[Granpa Simpson]

Thanx a lot Ridhika..I got stuck in this problem..grt to see it solved..!!!

[Granpa Simpson]

Which one..?is it q21?

[Ridhika]

Always happy to help you subhayu ! :) 

----- Reply message -----
From: "subhayu [via Discussion forum]" <ml-node+[hidden email]>
To: "Ridhika" <[hidden email]>
Subject: ISI 2007 ME-I - Doubts
Date: Fri, May 9, 2014 6:34 PM

Thanx a lot Ridhika..I got stuck in this problem..grt to see it solved..!!!

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[Granpa Simpson]

Thanx a lot again..do u have any idea regarding the cutoffs of the maths part in ISI entrance..??

[SINGHAM]

@shubhayu, please help me with this one!

[Ridhika]

So people say things like if you get 23-24 you are safe but then I've also heard that in years where the paper was exceptionally tough the cut off has gone as low as 15-16 .. all of it is speculation though .. 

----- Reply message -----
From: "subhayu [via Discussion forum]" <ml-node+[hidden email]>
To: "Ridhika" <[hidden email]>
Subject: ISI 2007 ME-I - Doubts
Date: Fri, May 9, 2014 6:50 PM

Thanx a lot again..do u have any idea regarding the cutoffs of the maths part in ISI entrance..??

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[sarawagisruti]

Q 29 Given that f is a real-valued differentiable function such that f (x) f ′(x) < 0 for all
real x, it follows that
(A) f (x) is an increasing function;
(B) f (x) is a decreasing function;
(C) f (x) is an increasing function;
(D) f (x) is a decreasing function.

[Ridhika]

Arey ! Subhayu has already explained this.. see the posts above ..

----- Reply message -----
From: "sarawagisruti [via Discussion forum]" <ml-node+[hidden email]>
To: "Ridhika" <[hidden email]>
Subject: ISI 2007 ME-I - Doubts
Date: Fri, May 9, 2014 9:00 PM

Q 29 Given that f is a real-valued differentiable function such that f (x) f ′(x) < 0 for all
real x, it follows that
(A) f (x) is an increasing function;
(B) f (x) is a decreasing function;
(C) f (x) is an increasing function;
(D) f (x) is a decreasing function.

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[Ridhika]

@subhayu I just realized in q28 option d is incorrect! Because it claims all the above are incorrect .. whereas we just saw that all the above are correct ! Lol.. ;)

----- Reply message -----
From: "subhayu [via Discussion forum]" <ml-node+[hidden email]>
To: "Ridhika" <[hidden email]>
Subject: ISI 2007 ME-I - Doubts
Date: Fri, May 9, 2014 1:32 AM

for Q28..all of the options seem to go with the problem given..

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[Granpa Simpson]

OMG..dat was really silly...!!!!