Top network posts

• 11 Finding the last two digits of a number
• 8 The expression $\sqrt{13+3\sqrt{\frac{23}{3}}} +\sqrt{13-3\sqrt{\frac{23}{3}}} $ is which type of number?
• 7 The roots of the equation $x^4-8x^3+ax^2-bx+16=0$ are positive if
• 7 Find the value of the series $\frac{8}{5} + \frac{16}{65} + \frac{24}{325} + \frac{32}{1025} + ...$ to 20 terms.
• 7 Find $\sum_{r=1}^{20} (-1)^r\frac{r^2+r+1}{r!}$.
• 6 Is my proof of $\lim_{x\to \infty}\frac 1x = 0$ correct?
• 6 Find $1^2+3^2+...99^2$ given $1^1+2^2+...+100^2$ and $1^1+2^2+...+50^2$
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