CBSE maths

i did a hell lot of mistakes today....[set-1]

plz tell if i will get any marks for it:::
1.in linear diff. equation i did not take exponent of integrating factor[2]
2.for boy probability one i just wrote answers.....as time was less[2]
3.for other differential i wrote an answer in taking exponent of tan^-1 to remove log from other two terms.which we don do usually will they try to understand it or strike off my answer??
4.for cos @ substituion differential two might be possible answers a negative and a positive.i wrote negative one in marking scheme they give only one answer???[2]

@tapan ya... something like this

5 ± ()log ± ()log

cant remember whether + or - ...

ya mine one also looks like this only

but that probability question is still a big ?

sandipan did u get the answer to area question(are bounded in the interior of 4x²+4y²=9 and the parabola x²=4y)

for the area integration got a sin inverse 2√2/3 +sumthing +sumthing
dont remember exactly

hey....probabbility 6 mark was easy[but i don want to stop ur grey cells from working so giving a hint:think of all formula u have in syllabus[not mathematical expression but the statement with that formula[1][1]
if anyone finds out ok.else at night i m giving full solution ok??]

BUT IRONY:::::::::::;
i told all students in my room how to do this question.but see wat pity.......in telling them many times i thought i did it......n cam home to see i have left it[2][2].as there was no tick nor do i remember writing in my paper telling them created a feel that i solved it[3][3]........this year is going too unlucky for me[2]

@yaar cheating karane me expert hain[1][1]

i think a lot will depend on d examiner who gets ur copy[4].
same for me[4].otherwise 0/6 in probability,although i wrote whatever thing was close to the problem[3]

really... is the answer 1/4...

if the method of the sum is utter rubbish... but answer correct.. how much marks am i supposed to get???

this is what i've done.... plz reply.... got too excited seeing AISSCE's edited post..

P(two balls white)=1/2

P(no balls white)=1/2

P(all balls white)=1/2 x 1/2 = 1/4

i know this has no meaning... can i sttill expect some... some marks !!! [112]

I got 3/5 (one of my frnds asked me to solve it)
Similar question also der in ADG... so verified from there

Dekho i posted my sol.n here (those who need it)

http://targetiit.com/iit-jee-forum/posts/probability-15330.html

Ppr theek-thak tha, no chance of a 100 [2]...but expecting 96 at least.

any one whu can answr 6 mark prob q on white balls

wat was the ans to that 6 marks probality ques on white balls?
plz reply

me too got the same che[1].
hence verified.

aisa koi question nahi tha

i gt 3/5

I've lost 7 marks till now..lols. Did any of you get that question in which three points were given, we had to find their vectors and also find the fourth point(they were part of a parallelogram)? I tried coplanarity but the lambda parameter vanished on using it! haha. So I had to do it using cross product of vectors(area of ||gm).

any one whu can answr 6 mark prob q

no pritish had no such ques.
cud do all ques on vectors and 3D amazingly!probability and 1 long integration almost took my soul out of me[2]

guys plzz tell