Qualification > Math
IGCSE MATHS Doubts
Vin:
--- Quote from: 6394 on May 18, 2010, 09:13:38 pm ---i need sequence formulas as wel
Thanks alot :) :D
--- End quote ---
s= a + (n - 1) d
d = common difference lik 2, 2, 2, ..
a = first term of sequence
..
Malak:
can anyone tell how to find the invariant line?
Vin:
--- Quote from: princess12 on May 18, 2010, 09:16:33 pm ---can any1 plz help me wid m/j 2001 q8c
i can not find in my pastpapers
--- End quote ---
i cant find the paper either ..
bulono:
i don't have that is my pastpaper...
Saavya:
help for sequences
Changing difference sequence formula
a + (n-1)d + 0.5(n-1)(n-2)C
Where -
a = the first term
d = the first difference
C = The difference increase.
an example of its use-
sequence: 3, 5, 9, 15, 24, ...
a + (n-1)d + 0.5(n-1)(n-2)C
3 + (n-1)2 + 0.5(n-1)(n-2)2
3 + 2n - 2 + n2 - 2n - n + 2
= 3 + n2 - n
Proof, by finding the 4th term:
3 + n2 - n
3 + 16 - 4
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version