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Does removing all numbers in the harmonic series with a units digit of 9 affect the series?
convergence
asked Feb 28, 2017 at 4:36
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Top Answers
11
Olympiad Algebra Practice Question
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11
Show that $\forall (a, b, c) \ \in \mathbf{R}: \frac{a^2}{b^2} + \frac{b^2}{c^2} + \frac{c^2}{a^2} \ge \frac{b}{a} + \frac{c}{b} + \frac{a}{c}$
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6
Evaluate $\sum\limits_{k=1}^n (k^{3} +k^{2} +1) / (k^{2} +k)$
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5
How do you compute the sum of k * a^k
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5
Functions satisfying: $f(f(x)^2+f(y))=xf(x)+y$
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5
A Straightforward optimization problem, but without calculus
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