ICSE − Q & A

Tricky questions 
1)How many people must be there in a room to make the probability 100% that two people in the room have same birthday?
2)How many people must be there in a room to make the probability 50% that two people in the room have same birthday?

Pg.291,q.1 from selina.....pls help. ...

Anyone if knows which chapters are going to carry maximum marks

can anyone tell me wat to do in constructions
my 5 chpts r left wbu guys

Q) A certain sum of money amounts to Rs. 57600 in 2 years and to Rs. 65,536 in 4 years at CI. Find:
1) the rate
2) the sum of money

In 2007 boards maths paper: http://www.respaper.com/icse/410/1625-pdf.html
in question 7 (b), We would get two loci of A... so we will get 2 inradii.... correct me if i m wrong

I have a problem for you guys. If you are engrossed in Studies pls IGNORE. I repaet Do not Even LOOK AT IT. And for all the others here it goes:- Take any integer , If it is an even number then halve it, or if it is an odd number then triple it and add 1.(It means :- if n is even then n= n/2. If n is odd n=(3*n)+1.)
And I know your answer it would end like this - 4,2,1 .............. infinty.
If you need help here you - http://www.nitrxgen.net/collatz/.
Rmember the reward is worlds best mathematician.
Cheers.
Don't blame me if you wasted your time.(even I wasted mine.)

http://www.respaper.com/anurag45/506-pdf.html The second paper is out as well 
Might be hard for some easy for many.....

If the balance on June 8th is Rs. 8030 and the balance on June 10th is Rs. 8680, which do we take as minimum balance?

Guys one thing has been constantly troubling me since many days.  In the computer exam,  when I took an additional sheet, the supervising examiner had signed on in. But the invigilator did not sign where there were three boxes (related to the continuation sheet) . Please tell whether something severe will happen or not.