IS1-2008 ME1 answer key link

[kangkan]

Hi..can someone provide the link to the answer key of isi 2008 m 1?

Thanks

[bhavya jain]

http://economicsentrance.weebly.com/uploads/1/1/0/5/1105777/isi2008.pdf

[kangkan]

Hi Bhavya..29 says limit does not exist..i am not quite able to understand why...thanks

[Dreyfus]

Kangkan...we r given that x is greater than 0
So when 0<x<1 then x^(-2n) would tend to infinity as n tends to infinity
When x=1 then x^(-2n) would become indeterminate as n tnds to infinity
And when x>1 then x^(-2n) would tend to 0 as n tends to infinity
Therefore no limit exist

[Ridhika]

The answer key says for 28.. d) decreasing in n.. whereas option d is initially increasing in n and then decreasing in n.. and a) is decreasing in n.. which is correct? and why?

Please also explain 6, 8, and 24 and 25? In 25 are we expected to integrate f(x) to get F(x) and therefore determine r(x).. or is there a shortcut.. ?

[Tania123]

Can someone explain Q22  please?

[Dr. Strange]

y= 5x^3 - 5x^2 +2x -1
dy/dx= 15x^2-10x + 2 which is always positive
 so y is strictly increasing
y(0)= -1
y(1)=1
so a root exists between 0 and 1

[Tania123]

@Dr. Strange. Thanks! :)