Maths

[abc123]

Can anyone help me out with nov 05 paper 1 q6b?

 

[abcde]

Sure. You should've posted the link but lemme check!

 

[abcde]

Okay so in part (b) the sequence is similar to that of part (a), the only exception being the first term. So you only have to alter the formula slightly and make it 1/2 (n+1) (n+2) . When the question says "write down" it's usually a hint that no working is required. So you've got to think in which way you can alter the formula. Just a mental trial and error.

 

[abc123]

alright but if we had to show it then how would we have gone about?

 

[abcde]

There's a formula for that. It's explained in another thread. I'll post the link here. wait...

 

[abcde]

Check this out: viewtopic.php?f=25&t=4147
Hope it helped!

 

[abc123]

thanks! I found my mistake