Mathematics: Post your doubts here!

leadingguy

leadingguy

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reina81 said:
MJ2011 P31 Q10 i, How did they get 2 for the values of A and B when it was split into partial fractions before integrating?

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_31.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_ms_31.pdf
Click to expand...


A/N + B/(1800 - N) = 1/(N(1800 - N)) original frm

A/N + B/(1800 - N) = 1 ......... take lcm

A(1800 - N)+ B(N) = 1

taking N = o

A(1800-0) B(0) = 1

A = 1/1800

now take N= 1800

A(1800 - 1800)+ B(1800) = 1

B = 1/1800
so the fraactions wil be

1/1800N + 1/(1800 - N)

now put it into the real differential eq. i.e

1/1800N + 1/(1800 - N). dn = 1/3600. dt

at the R.H.s 3600 is being divided so transfer it to the rite side

3600/1800N + 3600/(1800 - N)

[2/N + 2/(1800 - N) ] = dt

now solve it ....... hope u gt it(y)
 
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2pac

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Guys,I need help with the diagram related question in iteration.Normally they ask us to prove x or something using the diagram.
Some examples
q3 from may 2008.
q6 may 2010 p31.
q6 from may 2011 31 and many more.
Judging by this pattern,it seems though these questions are asked in the summer session so there is a high probability of it coming this time also.Please let me know how to tackle these type of questions,if any link available please let me know.
thanks
 
wahab305

wahab305

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i just did one mistake i took 3600 on other side messed up thing but when i tried a value of t my and ur answer and same solutions are marks cut for this
 
leadingguy

leadingguy

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wahab305 said:
i just did one mistake i took 3600 on other side messed up thing but when i tried a value of t my and ur answer and same solutions are marks cut for this
Click to expand...
u took 3600 on other side??? what does that mean?? sorry bt explain a little clearer plx
 
leadingguy

leadingguy

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wahab305 said:
brother exactly the same way u did but ms says that for partial fractions answer is 2/N + 2/1800+N
Click to expand...
if the final ans. u are arriving (the eq. ) is matching wid the ms. ans then I don't think that itx a big deal. as the partial fractions we did here is a way to reach the final ans.

apart if U did any mistake in solving partial fraction then surely it wil be penalised or else it wud nt hurt (y)

where as it is better to find the hint that 1800 is a multiple of 3600. it wil please the examiner and ur ans wil be easliy known
 
shanky631

shanky631

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2012-05-11_08-10_http-www.xtremepapers.com-pa.jpg

Can someone help me with this normal distribution question. And does suitable approximation always means normal distribution?????? plz help guys
 
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