# Mathematics: Post your doubts here!

#### Sareem Farooqui

The 8 mark question was basically asking us to firstly find the equation of the tangent to curve C1 and that same tangent will intersect somewhere with curve C2. Secondly find the value of k which was found out by using the formula b^2-4ac=0. You will ultimately be finding out the point of intersection of tangent with curve C2 which was (1.5 , 1) for me. Well, I am from Riyadh and mine was also v 12 so let's hope for the best, as soon as i handed over my paper to the invigilator, every student around me seemed to be so frustrated and all. Personally i did not feel that it was tough but lengthy.

#### Hamza Umair

Where can I find maths S1 topical past papers for recent years? (GCEguide has from 2002 -2010)

#### desterman

me too , how was it ?
I think I made a mistake in the Linear Combinations question, do you remember how you solved it? The one about plants

#### fourtris46

I think I made a mistake in the Linear Combinations question, do you remember how you solved it? The one about plants
yeah, the ans is 0.173 you do ( 1.5X + X) and find the new EX and VARX

#### desterman

yeah, the ans is 0.173 you do ( 1.5X + X) and find the new EX and VARX
Some people told me you have to multiply the final answer by 2, since it could be either of the plants, hopefully I did not make a mistake in another question, as threshold can be 45

#### Khitan

Isnt it without replacement? for part 2?My solution:
p(3,5) *2 =(4/5 *1/4)*2 but they havent reduced the total in second term why?

Anyone did P62?

#### Hamnah Zahoor

A***** How did you solved the first part of the last question in P62 yesterday?
6 Friends, Boats?

#### Kanekii

Does anyone have any notes foe Vectors P3?

#### hellodjfos;s'ff

A***** How did you solved the first part of the last question in P62 yesterday?
6 Friends, Boats?
Friends were to be divided into 3 boats so it's a selection/combination. 3 seat, 2 seat and 1 seat boats were available so 6C3*3C2*1C1=60 is the answer. Common mistake some people made was that they used permutations.

#### Hamnah Zahoor

Friends were to be divided into 3 boats so it's a selection/combination. 3 seat, 2 seat and 1 seat boats were available so 6C3*3C2*1C1=60 is the answer. Common mistake some people made was that they used permutations.
I solved it incorrectly and used permutations ....Unfortunately.

#### A*****

Friends were to be divided into 3 boats so it's a selection/combination. 3 seat, 2 seat and 1 seat boats were available so 6C3*3C2*1C1=60 is the answer. Common mistake some people made was that they used permutations.
Yes I did the same Hamnah Zahoor

#### A*****

And guys I spotted that the data wasn't arranged but was it affecting the lower quartile?

#### hellodjfos;s'ff

And guys I spotted that the data wasn't arranged but was it affecting the lower quartile?
Yes sadly it was. The lower quartile was 256.5 - if you assumed that the data was arranged then your lower quartile would have been 256.

#### Ebrahim12

Yes sadly it was. The lower quartile was 256.5 - if you assumed that the data was arranged then your lower quartile would have been 256.
No way....**** my life