Paper 22 math was so hard

[IyazAhmed-98]

What was the answer for the dice question?

 

[Suhayb.B]

Could you show an example plz? , it would really help

Yeah sure

Cubic sequences form: an^3 + bn^2 + cn + d.

We'll take this sequence as an example: 4, 16, 44, 94, 172, 284
Notice that the differences between these terms are: 12, 28, 50, 78, 112. But these differences are not constant. Ergo we will keep going..
Finding the differences once again, we get 16, 22, 28, 34. Yet again they're not constant..
Once more, 6, 6, 6. Now the differences are equal. We stop here. This is the difference at the third level.

Just like how we divide by 2 for the difference in a quadratic sequence, in a cubic we divide by 6. And hence a = (difference at third level / 6) = (6/6) = 1. So now it takes the form:
n^3 + bn^2 + cn + d.

Now is where it gets confusing for most:

We will form 3 equations to obtain the 3 unknowns: 'b', 'c' and 'd'
When n = 1, 1 + b + c + d = 4 [equation A]
n = 2, 8 + 4b + 2c + d = 16 [ B ]
n = 3, 27 + 9b + 3c + d = 44 [C]

From [ B ] - [A] --> 7 + 3b + c = 12 [D]
[C] - [ B ] --> 19 + 5b + c = 28 [E]
[E] - [D] --> 12 + 2b = 16
So b = 2

From [D] 7 + (3*2) + c = 12
So c = - 1

From [A] 1 + 2 - 1 + d = 4
So d = 2

Finally, we can form the rule: (n^3) + (2n^2) - ( n ) +2

If anyone's confused at *any* part, I'll be happy to help =)

 

[Suhayb.B]

What was the answer for the dice question?

Which question was that? I dont remember any dice question lol

 

[Umaima05]

What was the answer for the dice question?

I don't remember the answer but it was very easy just had to add all the probabilities and then subtract it from 1

 

[DXDEVIL130]

Yeah sure

Cubic sequences form: an^3 + bn^2 + cn + d.

We'll take this sequence as an example: 4, 16, 44, 94, 172, 284
Notice that the differences between these terms are: 12, 28, 50, 78, 112. But these differences are not constant. Ergo we will keep going..
Finding the differences once again, we get 16, 22, 28, 34. Yet again they're not constant..
Once more, 6, 6, 6. Now the differences are equal. We stop here. This is the difference at the third level.

Just like how we divide by 2 for the difference in a quadratic sequence, in a cubic we divide by 6. And hence a = (difference at third level / 6) = (6/6) = 1. So now it takes the form:
n^3 + bn^2 + cn + d.

Now is where it gets confusing for most:

We will form 3 equations to obtain the 3 unknowns: 'b', 'c' and 'd'
When n = 1, 1 + b + c + d = 4 [equation A]
n = 2, 8 + 4b + 2c + d = 16 [ B ]
n = 3, 27 + 9b + 3c + d = 44 [C]

From [ B ] - [A] --> 7 + 3b + c = 12 [D]
[C] - [ B ] --> 19 + 5b + c = 28 [E]
[E] - [D] --> 12 + 2b = 16
So b = 2

From [D] 7 + (3*2) + c = 12
So c = - 1

From [A] 1 + 2 - 1 + d = 4
So d = 2

Finally, we can form the rule: (n^3) + (2n^2) - ( n ) +2

If anyone's confused at *any* part, I'll be happy to help =)

Thanks alot bro!

 

[IyazAhmed-98]

I'm getting above 60 in math paper 2 Inshallah
What should I get in paper 42 so that I can guarantee an A*?

 

[chum1234]

is there anyone who did that helll ques. of Nth term..?

The answer is 2n^2 + 4 .... i didnt get it either

 

[chum1234]

srsly doesn't remember

6.5???

 

[chum1234]

My english listening paper sucked!!!! I will never get above 30 already losing six marks I hope the A* range is low this yearrr

 

[masterex567]

What was the answer for the dice question?

it was 0.2

 

[IyazAhmed-98]

For the question n(A) are we supposed to add the numbers or count them?

 

[AzusaNakano]

maan that paper was shit? Waterflow? nTh term? NO FRIGGIN COMPOUND INTEREST?


Examiners were probs high tbh

The answer to that nth term is 2n^2+3

 

[synkrash]

does anyone know if its possible to get an A in maths if you do badly in paper 2 ?

 

[AzusaNakano]

But for real i didnt find that Dice question :s
Looking forward to tomorrows Paper 42
Goodluck you guys!!

 

[rokiman]

does anyone know if its possible to get an A in maths if you do badly in paper 2 ?

Yea,dont be scary because paper 2 is 70 points (35%) and paper 4 is 130 points (65%),for C is 75 points so INSALLAH,i think that you can get A

 

[Mustafa84922]

The answer is 2n^2 + 4 .... i didnt get it either

ITS 2n^2+3

 

[IyazAhmed-98]

I'm getting above 60 in math paper 2 Inshallah
What should I get in paper 42 so that I can guarantee an A*?

 

[Mustafa84922]

I'm getting above 60 in math paper 2 Inshallah
What should I get in paper 42 so that I can guarantee an A*?

You have to get at least 120 out of 130 xD

 

[IyazAhmed-98]

That's high af!

 

[Mustafa84922]

That's high af!

yea i know that and i at least have to get 115 im worried cuz i was sure i would get an a* in maths.............