One final thing guys. Can anyone help me with the final two parts of the last question of paper 4 Nov 09?? (If it has already been answered then just mention the page number). By the way, anyone has any ideas on how to tackle such questions??? I mean it's all fine and great through out the paper until I reach the final parts of the last question....
It's really quite simple.
In (f), In n(n+1), you replace n by (n-1), because you want the total of the first (n-1) even numbers, not n.
So, answer= n(n-1) after simplification.
In (g), look at the first line of the Q of (e).
For Row 3, (3 x 7) + 2 + 4
i.e (number of row X first number in row) + sum of first (n-1) even numbers. [row is three, however the even numbers are 2, so n-1]
Replace the nth terms in above,
[(n) x (n^2 - n - 1)] + n(n-1)
i.e [c(i) x (d)] + (f)
Simplify, and you get n^3, which is equal to c(ii).
