Summation

What does \sum^n_{r=1} r^2 mean?

That’s what the \sum symbol means!

Write \frac12+\frac13+\frac14+\frac15+\frac16 using sigma notation

\sum^5_{r=1} \frac{1}{r+1}

Write \frac12+\frac14+\frac18+\frac1{16}+\frac1{32} using sigma notation

\sum^5_{r=1} \frac{1}{2^r}

flashcards

QuestionAnswer
What does \sum^n_{r=1} r^2 mean?A sum where the counter r starts at 1, increases by 1 until n, includes r=n, calculates r^2 for each r, and adds all r^2 values together.
Write \frac12+\frac13+\frac14+\frac15+\frac16 using sigma notation\sum^5_{r=1} \frac{1}{r+1}
Write \frac12+\frac14+\frac18+\frac1{16}+\frac1{32} using sigma notation\sum^5_{r=1} \frac{1}{2^r}