1)A sequence is defined by Tn= Tn-2/Tn-1 for n>=3 with T1=20 and T2=2.

[night_stroller]

1)A sequence is defined by Tn= Tn-2/Tn-1 for n>=3 with T1=20 and T2=2. find the 4th term.

2) The general term of a sequence is Tn=2^n-2. Find n if Tn=1/128.

What's the answer? Please help. Thanks.

 

[sutupidmath]

well, for the first one it is quite easy

what is the 3rd term.

T3=T1/T2, right? so the 4rth term would be T4=T2/T3, right?

2) well all you need to do here is set 1/128=2^n-2 and solve for n? do you know how to do it?