What is the sum of a 6-term geometric series if the first term is 19 and the last term is 319,333?

Question

anonymous · Answer

etermine the three cubic roots of 8.give the answer in the form of a+bj.also give the main root in the exponential form

anonymous · Answer

dude that sounds so complex...

anonymous · Answer

Ya cos cubic roots of 8 is 2.2.2 so wanna know how to solve it

campbell_st · Answer

the 6th term is 319333

you need to find r

so 

$$319333 = 19\times r^{6 -1}$$

$$\frac{319333}{19} = r^5$$

then$$ r = \sqrt[5]{\frac{319333}{19}}$$

Once you know r

then use 

$$S_{6} = \frac{19(r^6 -1)}{r -1}$$

that will give you the sum of the 6 terms