Determine the tenth number in each number pattern:

a) 12,3,-6....

b) -18,-7,4...

is there any other way to get the 10th term rather than just keep going till i reach the 10th number?

thankies :)

Printable View

- Dec 20th 2006, 03:37 PMpuppy_wishsimple sequence question
Determine the tenth number in each number pattern:

a) 12,3,-6....

b) -18,-7,4...

is there any other way to get the 10th term rather than just keep going till i reach the 10th number?

thankies :) - Dec 20th 2006, 03:47 PMgalactus
Try $\displaystyle a_{n}=a_{1}+(n-1)d$

$\displaystyle a_{1}$ is the first term.

d=common difference.

n=the nth term you want

Try #1 for the 10th term:

$\displaystyle 12+(10-1)(-9)=-69$

Now, try the 2nd one yourself. OK?. - Dec 20th 2006, 04:50 PMpuppy_wish
thanx a lot! :)