Find the sum of each of the geometric series given below. For the value of the sum, enter an expression that gives the exact value, rather than entering an approximation. A.
I got -4 which is wrong.
Any thought on that one ?
Find the sum of each of the geometric series given below. For the value of the sum, enter an expression that gives the exact value, rather than entering an approximation. A.
I got -4 which is wrong.
Any thought on that one ?
you found the sum of an infinite geometric series ... this one is finite.
Find the sum of each of the geometric series given below. For the value of the sum, enter an expression that gives the exact value, rather than entering an approximation. A.
I got -4 which is wrong.
Any thought on that one ?
a = -6, r = -1/2 and n = 13. Substitute into the usual formula. Please show your work and say where you're stuck if you need mor help.
yea I got r is -1/2. which has a abs value<1.
and put in to a/(1-r) then I got -4. I didnt use n though
You were told all the way back in post #2 that you had the wrong formula!
Your series is NOT infinite, it is FINITE. Go to your class notes or textbook, find the formula for a finite geometric series and substitute the appropriate values into it.
You were told all the way back in post #2 that you had the wrong formula!
Your series is NOT infinite, it is FINITE. Go to your class notes or textbook, find the formula for a finite geometric series and substitute the appropriate values into it.
Finally got it. I didnt notice is finite, the whole chapter is about infinite.
Thanks