# Sum of Series Using Standard Results

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#1
I've tried the attached question but a bit stuck on how to proceed. Is anyone able to help?
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1 month ago
#2
(Original post by beachpanda)
I've tried the attached question but a bit stuck on how to proceed. Is anyone able to help?
Is the +6 inside or outside the summation.
Last edited by mqb2766; 1 month ago
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#3
(Original post by mqb2766)
Is the +6 inside or outside the summation.
I assumed it was inside - they hadn't used any brackets so it's a bit unclear?
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1 month ago
#4
i think the 6 is separate from the summation.
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1 month ago
#5
(Original post by beachpanda)
I assumed it was inside - they hadn't used any brackets so it's a bit unclear?
It's not obvious. It would be either +6 or +6b when you evaluate the sum.
Looking at the numbers, it Is guess +6b may make more sense, but will check now.
Last edited by mqb2766; 1 month ago
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1 month ago
#6
Once expanded, +6 rather than +6b works nicely.
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1 month ago
#7
(Original post by ghostwalker)
Once expanded, +6 rather than +6b works nicely.
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1 month ago
#8
(Original post by the bear)
lol
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#9
I've taken the 6 as outside the sum and now have this - but still unsure how to solve when I've polynomials in both variables?
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1 month ago
#10
What are the surrounding questions like?
They may just want you to sub a few values in?
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#11
(Original post by mqb2766)
What are the surrounding questions like?
They may just want you to sub a few values in?
Other questions have just been about substituting for the standard results where the sigma notation is - I'm about to learn method of differences?
Last edited by beachpanda; 1 month ago
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1 month ago
#12
(Original post by beachpanda)
Other questions have just been about substituting for the standard results where the sigma notation is - pre-method of differences?
The answer is a small number(s) which can be obtained by writing the first few values down. That may be sufficient?
Understanding a) and c) is not too hard as c) is the square of triangular numbers (a) with different index which you can do a bit of reasoning about. Possibly beyond what is required.
Last edited by mqb2766; 1 month ago
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