CSAT Sample Paper Answers and Discussion

Hey I'm getting a slightly different answer, when you're calculating the area of AB1C1, what value are you using for the base? Because the area of the first triangle for me was

Sample Paper 2, Question 11?

dont even know what im supposed to do? Write a script?

Anyone done Sample Paper 2, Question 11?

Sample Paper 2, Question 11?

For Paper 2 Q11, I got this:

Strategy (1)


Strategy (2)
Repetitive algorithm (I think this is what's meant in the question)


More efficient algorithm (might be this)

I understand what the problem is and how it works, I just have no clue how to solve it

This was my method I think the end answer by was similar to popicecold I don't remember though

Yeah, that's exactly what I did. Has anyone got an answer for sample paper 2 question 12?

Here is my "so-called" solution to Paper 2 Question 4. It's not so elegant. Any better solutions?

Sample Paper 2, Question 11?

Could you maybe explain why you took the difference between the 5th and 2 times the 4th?

Try doing a couple of examples, e.g if you have [0,2] and [1,3] you essentially substract 2-1 to get to the answer, after a couple of examples a pattern should emerge. Then what happens if you use that method and there is no overlap?

Sorry if this isn't helpful I'm not great at explaining stuff

In the end I got to the answer

To eliminate sigmaY, so the analysis can be made easier as there remain only 2 variables, sigmaX and z.
The problem is that this is a constructive proof. I'm not sure whether sigma X can be zero, so I prove "bigger than or equal to" at this stage and by finding an example I show the existence of "equal to "

Ps: nice to see you again

For Paper 2 Q11, I got this:

Strategy (1)


Strategy (2)
Repetitive algorithm (I think this is what's meant in the question)


More efficient algorithm (might be this)

Anyone done Sample Paper 2, Question 11?