2
Jan
2021
Question of the Day
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Test for absolute convergence: $\displaystyle\sum_{n=1}^{\infty}\frac{n! (x-2)^n}{ n^2 }$
1
Jan
2021
Question of the Day
Test for absolute convergence: $\displaystyle\sum_{n=1}^{\infty}\frac{(x-4)^n}{ n }$
31
Dec
2020
Question of the Day
Test for absolute convergence: $\displaystyle\sum_{n=1}^{\infty}\frac{2^n x^n}{ n^2 }$
30
Dec
2020
Question of the Day
Consider the sequence $ x_{n} = \frac{1}{n} $ if $n$ is odd and $x_{n} = 1$ if $n$ is even. Does this sequence converge?
29
Dec
2020
Question of the Day
Consider the sequence $ x_{n} = \frac{1}{n} $ if $n$ is odd and $x_{n} = 0$ if $n$ is even. Does this sequence converge?
28
Dec
2020
Question of the Day
Prove that $\sqrt{2}+\sqrt{3}$ is irrational without assuming any particular surd is irrational i.e. you must prove first that a surd like $\sqrt{6}$ is irrational.
27
Dec
2020
Question of the Day
Prove that cubic equations (of real coefficients) must have at least one real root.
26
Dec
2020
Question of the Day
Find the region of convergence for the Taylor Series of $\ln(1+x)$ expanded at $x_0=0$.
25
Dec
2020
Question of the Day
Find the region of convergence for the Taylor Series of $\frac{1}{1+x}$ expanded at $x_0=0$.
24
Dec
2020
Question of the Day
Does the following converge or diverge? $\int_{0}^{3} x^{-\frac{2}{3}} dx$