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Tagged with summation power-series
362
questions
5
votes
2
answers
157
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Sum up to number $N$ using $1,2$ and $3$
So the question asked was finding out the number of ways(combinations), a given number $N$ can be formed using the sum of $1,2$ or $3$.
(eg)
For $n = 8$, the answer is $10$
The given solution for ...
- 178k
4
votes
4
answers
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Index change of variable with product
This is probably a dumb question, but oh well here it is:
One day a student came to me and asked: Why isn't
$$
\sum_{k=0}^{\infty} \frac{1}{2^{2k}}=\sum_{n=0}^{\infty} \frac{1}{2^{n}}$$
using a ...
CommunityBot
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