ISI Sample Paper PEA 2016 Discussion

[varnika1880]

Yes u r right but I tried solving by taking different values of a (1/2,1/3,14) it was coming out to be continuous

[Dr. Strange]

you can't take a nonzero value for a.
because if you take a as nonzero then F(infinity) becomes ax+b=infinity which is not possible.
so a should be 0 and b should be 1

[eco201611]

can you tell me how to solve question no. 18 ??

please

[Dr. Strange]

No. of points in a circle =n
Since no three points can be collinear so no. of triangle=C(n,3)
No. of line segments =C(n,2)
No.  of ways in which 3 line segments can be chosen= C(C(n,2),3)
Probability= C(n,3)/C(C(n,2),3)

[Amit Goyal]

ISI 2016 PEA Answer Key

[Addy-2]

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[Abhitesh]

Put x=y in f(x)
f'(x) = 0 => x=2,1
Then check the value of f''(2)>0 and f''(1)<0
Option A is correct.

[Addy-2]

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[Abhitesh]

Global max/min is asked since domain is R^2. So none of them exist.

[Addy-2]

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[ecom]

can someone please explain the answer for Q11.

[TheFlash]

Hi
Can you explain the reasoning behind Q 20 ?