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Author Topic: IGCSE MATHS Doubts  (Read 130376 times)

Offline mdwael

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Re: IGCSE MATHS Doubts
« Reply #975 on: May 18, 2010, 08:22:25 pm »
1,2,4,7,11,16 whats the nth term for this kindof sequence? gradually adding by increasing numbers +1 +2 +3 but how do you find the nth term?
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Offline CatAly$t

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Re: IGCSE MATHS Doubts
« Reply #976 on: May 18, 2010, 08:24:05 pm »
Quote from: ~VIN1094~ on May 18, 2010, 07:19:52 pm
all taken from the forum ..

thanks!!!u saved my life.... :D
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Offline Ghost Of Highbury

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Re: IGCSE MATHS Doubts
« Reply #977 on: May 18, 2010, 08:28:32 pm »
Quote from: mdwael on May 18, 2010, 08:22:25 pm
1,2,4,7,11,16 whats the nth term for this kindof sequence? gradually adding by increasing numbers +1 +2 +3 but how do you find the nth term?

'Changing Difference' Sequences

The general term for term number 'n' , common diff. 'd' , first term 'a' and difference change 'c'is:

a+d(n-1)+c/2(n-1)(n-2)

a = 1
d = 1 (first difference)

1  2  4  7   11
  1  2  3   4

    1  1  1

c = 1 (final difference)

a+d(n-1)+c/2(n-1)(n-2)

1+(n-1)+0.5(n-1)(n-2)

1+n-1+0.5(n^2 -3n + 2)

1+n-1+0.5n^2 - 1.5n + 1

0.5n^2 -0.5n + 1.


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Offline M'i'D'o

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Re: IGCSE MATHS Doubts
« Reply #978 on: May 18, 2010, 08:33:09 pm »
Can anybody plz solve the question 9 in nov 06 paper 4 and attach it for me...
Inequalities... I HATE IT.. plzz heeelp i'm dying for it......
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Offline Shazizzzle

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Re: IGCSE MATHS Doubts
« Reply #979 on: May 18, 2010, 08:37:12 pm »
Keeping up with everything here is so hard! :P At times, there are like 7 replies once you click submit.

Anyway, I'm having an offline revision today, so later guys.

And BEST OF LUCK! :D
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Offline Candela

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Re: IGCSE MATHS Doubts
« Reply #980 on: May 18, 2010, 08:41:34 pm »
i think probability is a must! :S
wat other topics r u guys expecting?!
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Offline Shazizzzle

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Re: IGCSE MATHS Doubts
« Reply #981 on: May 18, 2010, 08:43:57 pm »
Quote from: Candela on May 18, 2010, 08:41:34 pm
i think probability is a must! :S
wat other topics r u guys expecting?!


The examiner is fond of investigating questions, so
1. Probability
2. Sequence
Both are for sure.

As transformations and graphs are considered 'easy' and of 'free marks' by the examiner, and as they appeared in N09, I can bet there won't be any this session.

Umm, statistcs.
Also, angle properties!
And trignometry!
And, ofcourse, the first question, relating to percentages.
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Offline $H00t!N& $t@r

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Re: IGCSE MATHS Doubts
« Reply #982 on: May 18, 2010, 08:45:30 pm »
guys plz help me with p4 nov 1999 q10
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Offline ~HyDrOgEn~

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Re: IGCSE MATHS Doubts
« Reply #983 on: May 18, 2010, 08:49:10 pm »
Please urgent response <BEARING>
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Offline princess12

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Re: IGCSE MATHS Doubts
« Reply #984 on: May 18, 2010, 08:49:42 pm »
HEY SHOOTING STAR WE SHOULD THE PASTPAPER FROM 2003
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Offline Candela

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Re: IGCSE MATHS Doubts
« Reply #985 on: May 18, 2010, 08:49:50 pm »
Quote from: Shazizzzle on May 18, 2010, 08:43:57 pm
The examiner is fond of investigating questions, so
1. Probability
2. Sequence
Both are for sure.

As transformations and graphs are considered 'easy' and of 'free marks' by the examiner, and as they appeared in N09, I can bet there won't be any this session.

Umm, statistcs.
Also, angle properties!
And trignometry!

And, ofcourse, the first question, relating to percentages.

can u tell me all the formulas for sequences!
i jus know -- > a+ (n-1) d
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Offline princess12

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Re: IGCSE MATHS Doubts
« Reply #986 on: May 18, 2010, 08:50:45 pm »
a+ (n-1) d
WHAT IS A N D
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Offline $H00t!N& $t@r

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Re: IGCSE MATHS Doubts
« Reply #987 on: May 18, 2010, 08:53:26 pm »
Quote from: princess12 on May 18, 2010, 08:49:42 pm
HEY SHOOTING STAR WE SHOULD THE PASTPAPER FROM 2003
the thing is that ive done them all and im doing the ones before that for further practice. so... can you help me with the question i asked?
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Offline NidZ- Hero

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Re: IGCSE MATHS Doubts
« Reply #988 on: May 18, 2010, 08:56:12 pm »
can any1 plz help me wid 2002 m/j b(ii)
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Offline ~HyDrOgEn~

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Re: IGCSE MATHS Doubts
« Reply #989 on: May 18, 2010, 09:02:24 pm »
No One is Helping me WIth bearings. i feel bad[/size]
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