Discussion and Suggested Solutions - Mathematics 2017

[Anything]

Wait there was a fucked up series this year??

Perhaps referring to the question that asked for values of a to make a limiting sum = 2 where a is the first term

[Opengangs]

welp, there goes my 100/100 dream after that atrocious silly mistake of M_16 = 0 fml
everything else felt pretty easy, I bs'ed the iso proof tho.

[Dylpickle01]

I bs'ed the iso proof tho.

Same
Did anyone manage to get the x value for the bicycles?

[RuiAce]

Perhaps referring to the question that asked for values of a to make a limiting sum = 2 where a is the first term

Lol that's new.

[Anything]

Lol that's new.

They didn't give any values, aside from the limiting sum having to equal 2

[Dylpickle01]

Lol that's new.

Weren't given r either

[itsAnuu]

0 < a < 4 was the answer

[RuiAce]

Ok that's very new. I'll have to wait for Jamon to show me the question itself then...

[Opengangs]

They didn't give any values, aside from the limiting sum having to equal 2

Use the fact that |r| < 1 for a limiting sum to exist

a/(1 - r) = 2
a = 2(1 - r)
Now, -1 < r < 1
1 > -r > -1
2 > 1 - r > 0
4 > a > 0

[itsAnuu]

Use the fact that |r| < 1 for a limiting sum to exist

yeh easy q

[1MARIE1]

yeh easy q

Wasn't it worth like 3 marks? or was it 2?

[RuiAce]

Use the fact that |r| < 1 for a limiting sum to exist

a/(1 - r) = 2
a = 2(1 - r)
Now, -1 < r < 1
1 > -r > -1
2 > 1 - r > 0
4 > a > 0

Ahh right. After I saw what was above I instantly questioned if it had to do with the |r|<1 scenario.

Still though, I want to see the exact wording of this Q...

[RuiAce]

yeh easy q

It's honestly so hard to call a question easy these days. Especially for some people in the middle of the actual exam.

Because whereas the computations can be fairly simple, trying to get that moment of inspiration to getting started isn't so simple for some.

[ellybubble]

Wasn't it worth like 3 marks? or was it 2?

i think it was worth 3 marks, so quite alot

[Zainbow]

that paper was harder than expected tbh, I didn't have enough time to go over and check my answers