The population of a type of local dragonfly can be found using an infinite geometric series where a1 = 65 and the common ratio is 1/6. Find the sum of this infinite series that will be the upper limit of this population.
A. 78
B. 28
C. 11
D.32

Question

The population of a type of local dragonfly can be found using an infinite geometric series where a1 = 65 and the common ratio is 1/6. Find the sum of this infinite series that will be the upper limit of this population.
A. 78
B. 28
C. 11
D.32

sdfgsdfgs · Answer

do u know the general form of a geometric series with a1 and the common ratio?

sdfgsdfgs · Answer

an = a1(CR)^n

anonymous · Answer

What is the C?

sdfgsdfgs · Answer

why u said the ans is C?

anonymous · Answer

No i mean you put in the formula the letter c

sdfgsdfgs · Answer

Oooo sorry i mean to say

an = a1*(Common Ratio)^n

anonymous · Answer

Oh okay . 
What woud the 'an' be though 
a1= 65
and cr = 1/6
How would you find an or letter n

sdfgsdfgs · Answer

Geometric series is a series of numbers...

1st no. = a1
2nd no. = a2 = a1*CR
3rd no. = a3 = a2*CR=a1*CR*CR
....
nth no.=an=a1*(CR)^n

sdfgsdfgs · Answer

U may need to read up on geometric series before u can do this prob. plz read ur study material or check out wikipedia: https://en.wikipedia.org/wiki/Geometric_series

anonymous · Answer

@sdfgsdfgs

sdfgsdfgs · Answer

yes @Lala3712 so do u understand what a geometric series is now?

anonymous · Answer

Yes

sdfgsdfgs · Answer

good :) see if u can understand this.. http://openstudy.com/study#/updates/536fda91e4b09cc1503c7c34