Question

Evaluate the series 72 + 12 + 2 + . . .

a.14.4
b.432
c.6
d.86.4

Answer 1

72 / 6 = 12
12/6 = 2
2/6 = 1/3
1/3 / 6, etc ,etc

Answer 2

I believe it will converge to 86.4

Answer 3

This is an infinite geometric series, starting at 72 with a common ratio 1/6

Answer 4

so d?

Answer 5

Formula is
\[\Large S = \frac{a}{1-r}\]
where a is the first term and r is the common ratio...

Answer 6

Yeah, D seems right :)