Question

What is the sum of the geometric sequence 3, 12, 48, … if there are 8 terms?

Answer 1

@rishavraj

Answer 2

see sum of geometric series =
\[a_1 \times \frac{ r^n - 1 }{ r - 1 }\]
where r is common ratio , n is no of terms and
a_1 is the first term

Answer 3

But itsn't it a geometric sequence?

Answer 4

yup it is a geometric sequence..i mentioned it ...

Answer 5

Sorry! You wrote series so I got confused. Anyways, I got 65535 as an answer?

Answer 6

yup :))

Answer 7

Yay! Will you help with one more?

Answer 8

yeah :))

Answer 9

Given the arithmetic sequence an = 6 − 4(n + 2), what is the domain for n?

Answer 10

see n is no or terms so it can only hav positive values

Answer 11

so n>1?

Answer 12

Thanks:)

Answer 13

\[n \ge 1\]

Answer 14

yes! Thanks so much:)