Question

Find the S10 for a geometric series with 1st term 10 and common ratio 4. Check answer?

Answer 1

I got 1,048,586.

Answer 2

well that doesn't seem correct

the formula is

\[S_{n} = \frac{a(1 - r^n)}{(1 - r)}\]

so for your question

\[s_{10} = \frac{10( 1 - 4^{10})}{(1 - 4)}\]

hope it helps

Answer 3

Wait, I just redid it and got a much higher answer: 10,485,750 ?
@campbell_st

Answer 4

nope... I got about 3.5 million

Answer 5

Thank you so much!