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Calculate the sum of the followingnon-terminating progression:
2/10, 2/40, 2/160, 2/640,...
Suggested Answer: C
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37 comments · newest first
PH
Phil
10 months ago
The first term is 2/10 and the ratio is 1/4.
NI
Niesha
11 months ago
Totally agree, C seems right!
FR
Francine
11 months ago
Wait, are you sure about that?
CA
Carmen
11 months ago
I think the sum is around 0.267.
EL
Elza
11 months ago
This is a geometric series!
AL
Aliza
12 months ago
I believe the common ratio is 1/4, but I’m not entirely confident about the calculations. I should double-check my work!
BR
Brock
12 months ago
I’m a bit lost on how to apply the formula for the sum of an infinite series. Is it just a/(1-r) for this type?
LA
Laquanda
12 months ago
I remember practicing similar questions where we had to identify the first term and the common ratio. I think the first term here is 2/10.
BE
Bette
1 year ago
I think this is a geometric series, but I'm not sure how to find the sum of a non-terminating one.
RE
Rebecka
1 year ago
Okay, I think I've got it. The common ratio is 1/4, so I can use the formula to calculate the sum. I'm feeling good about this one.
JA
Janet
1 year ago
This is tricky. I'm not confident I can solve this quickly during the exam. I'll need to think it through step-by-step.
JO
Johnetta
1 year ago
I've seen problems like this before. If I can identify the common ratio, I should be able to find the sum of the series.
ET
Ettie
1 year ago
Hmm, I'm not sure how to approach this one. The numbers in the progression don't seem to have a clear pattern. I might need to try a different strategy.
CA
Carlota
1 year ago
Okay, this looks like a geometric progression problem. I think I can use the formula for the sum of an infinite geometric series to solve this.
GU
Gussie
1 year ago
Ah, I see. Disabling the Go Live Approval and continuing the build despite failures is probably the fastest way to get this hot-fix out there. I'll make sure to document this for the dev team, though, in case it causes any issues down the line.
AL
Aleta
1 year ago
Is it just me, or does this progression look like it's trying to hypnotize me? Focus, Aleta, focus!
PO
Portia
1 year ago
C) 0.267
RO
Rolande
1 year ago
B) 0.266
IO
Iola
1 year ago
A) 0.174
RO
Royce
1 year ago
Man, I wish I had a crystal ball to see the answer. Maybe I can just guess and hope for the best?
NI
Nikita
1 year ago
Okay, time to bust out the calculator and start crunching the numbers. This better not be one of those sneaky questions.
IV
Ivette
1 year ago
D) 0.406
ST
Stefania
1 year ago
C) 0.267
AL
Allene
1 year ago
B) 0.266
ST
Stevie
1 year ago
A) 0.174
TR
Truman
1 year ago
Wait, is this a trick question? I feel like I'm missing something obvious.
BE
Bettina
2 years ago
Ooh, I love these geometric progression questions! Let's see, what's the common ratio here...
TO
Tomas
1 year ago
So the sum is 2/10 / (1 - 1/4) = 2/10 / (3/4) = 8/30 = 4/15 = 0.266.
BL
Blondell
1 year ago
The common ratio is 1/4.
ST
Stanford
1 year ago
So, the answer is B) 0.266.
LA
Lawanda
1 year ago
Which is equal to 0.266.
BE
Bea
1 year ago
So, the sum would be 2/10 / (1 - 1/4) = 2/10 / (3/4) = 8/30 = 4/15.
TH
Thaddeus
1 year ago
The common ratio is 1/4.
TA
Taryn
2 years ago
Hmm, this looks like a tricky one. I'll have to think through this step-by-step.
ER
Erick
2 years ago
I calculated it and got D) 0.406 as the answer.
JO
Josephine
2 years ago
I disagree, I believe the answer is C) 0.267.
HA
Haley
2 years ago
I think the answer is B) 0.266.