$$1+ \frac12 + \frac14+\dots+\frac1{2^n}$$
To find the sum of the equation you have to find $n$, the number of terms in the geometric sequence and I don't know how...
The answer in the text book is $2-\frac1{2^n}$.
I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...
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