# Suggested Answers to 2013 A Level H2 Math 9740 Paper 1 (11 Nov)

END OF PAPER

Note: The above answers had been hurriedly worked out by Mr Teng, our H2 Math tutor.

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Errata: question 7(iii)
This question is really confusing due to the word “before”. However, after much discussions, Mr Teng concludes that he is wrong. The answer should be n=12. If you put the emphasis on how many MUST be cut off, 12 will be the correct answer. If you’re my student, you will know that my English is terrible. Haha.

Question 6(iii)) should λ = 8μ/7.

Question 9(iii) due to the lousy app should be 24n.

Disclaimer: Question 3
The line y=1 was drawn as part of my solution to (ii). So long as the diagram is clearly labeled, there should be no issues.

Any more issues, please let me know. Lastly, big thank-you to all the j1 and j2s who helped me clarify and explain the English behind the statement. And do watch out this space for P2!

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### 22 Responses to Suggested Answers to 2013 A Level H2 Math 9740 Paper 1 (11 Nov)

1. Prisca Ho says:

Hello,
For Q7(iii) n>11.25
thanks for noting

• KS says:

Yup! Noted with thanks!

2. U for math says:

Question 6, 7 and 9 are wrong
6: a x b is not equal to b x a. The 6/7 part should not exist.
7: n is a minimum, dividing the ln on both sides, which is negative, switches the sign of the inequality. n greater than or equal to 12.
9:summation of 1 to n of 24 is 24n, not 24

• KS says:

Thanks for pointing out the mistakes!

3. nicholas says:

Agreed. Qn6 a x b nt equal to b x a sincr cross prdt. I got langa= 8u/7 instead

• KS says:

Yup you’re right, Nicholas. Like the previous comment, it cancels out so λ = 8μ/7. Thanks! 🙂

4. KS says:

@ Prisca & U For Maths:
I agree with you for Question 7. Very careless. Furthermore, I misread the question too; overlooked the “must” in front of the “before”. Thanks for pointing out.

@ U For Maths:
You’re right for Question 6 too. b x a = -a x b so it will cancel out. The 6/7 will not exist. Questions 9 was an extremely careless mistake as I was just rushing and didn’t check through. Thanks for pointing that out too!

P.S. You don’t seem to be getting U for math.

Apologies on these mistakes. I was rushing the suggested solutions and had classes from 4pm and errata, wasn’t ready until 1am last night.

Thanks for pointing them out! Please let me know if there is more error.

5. ilyasa says:

I would like to highlight the following:

For Q7, Mr Teng remembered to change the sign when dividing by a negative number. His mistake was in the first line when he should have written “> 380” instead of “< 380". For Q9, Mr Teng did write 24n, but when he took a photo of his answer, the "n" part was cut off. Thank for the feedback so far.

6. M3 says:

For qn 1, if the ans is.. from GC, there is no solution, hence the 3 planes do not intersect with one another.. will it be given full mark, since 3 marks suppose to give more working.. Thanks 🙂

• KS says:

Hi M3, there are several answers. I would think that the “no solutions” will be 1 mark while explaining two relationship should give the full marks. Some other explanation/ relationship that you can derive is that the normals are non-parallel and the planes will form a triangular prism. 🙂

7. GGforMath says:

Hi, for Qn 6(iii), is the area of Triangle OMC = 1/4

• KS says:

Hi, I don’t recall being able to solve for the exact area cos the values of vectors a and b were not given.

• GGforMath says:

sry my comment was cut off. i mean area = 1/4Lanbda mod( b x a).

And how to gte ans 8mew/7. Thx a lot =)

• KS says:

Hi, I don’t think so. Try to reference the steps above, its entirely similar. I made a blunder at the (iii) third line whereby I overlooked my expansion, Area OMC should be as suggested. You can refer to nicholas’s comment above too.

8. 1T15 says:

Hi, will you be posting the H1 math paper answers?

Hi. sorry, we won’t be. we meant this for our own students references and we don’t have students taking h1 math this year.

9. DLai says:

Hi can i ask a few questions?

For Q2, must write y is Real? Without it will minus marks?

For Q3, (ii) can solve the inequality using the normal way and not using the graph?

For Q9, (iii) if I didn’t use the r(2r^2+1) for 2r^3 + r but instead did the sum r^3 = (n/2(n+1))^2 and sum r = n/2 (n+1) is it still correct?

Thank u very much!

hi,
Q2: I doubt Cambridge will be particular about that. 🙂
Q3: Sure. They did not specify “hence”.
Q9: I don’t see a problem in using a formula. Furthermore, they did not state “hence”.

• DLai says:

Thank you!

Thanks for providing the suggested answers so efficiently!!

• KS says:

You’re welcome. 🙂 Just suggested solutions only. haha

10. Florence says: