Sequences and Series (1 Viewer)

[Pethmin]

How is q1 a) done?

 

[cossine]

How is q1 a) done?

There is no 1a

 

[Pethmin]

sorry q5

 

[cossine]

sorry q5

So it should be 200*(1-r)^4 = 170

 

[Pethmin]

oh so is it just substitution?

 

[cossine]

oh so is it just substitution?

You just need to know what a geometric sequence is.

 

[Pethmin]

You just need to know what geometric series is

yeah so tn=t1xr^n-1- and just sub into the formula?

 

[cossine]

yeah so tn=t1xr^n-1- and just sub into the formula?

I would avoid x and replace that with * but yes. the nth term of geometric sequence is a*r^(n-1)