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 6h revised Approximation of an expression (no calculator please!) added 2 characters in body Apr16 revised Quotient group(Factor group) mathjax added; Apr15 revised Why non-real means only the square root of negative? mathjax added; Apr14 revised Find remainder when $2^{30}\cdot 3^{20}$ is divided by $7$ without using calculator mathjax added; Apr9 revised Analysis of how-many-squares and rectangles are are there on a chess board? mathjax added; Apr5 revised General solution of $y''+y'=0$ mathjax fixed; Mar29 revised Does $^nC_{n+1}$ exist? mathjax added; Mar29 revised Figuring domain of constant $a$ in a equation with some condition added 231 characters in body Mar27 revised Find value of $k$ for which the equation has real roots deleted 1 character in body Mar26 revised How to draw the graph of $x^6 = y^3$ and $3y = (log x)^2$? mathjax added; Mar26 revised How to draw the graph of $x^6 = y^3$ and $3y = (log x)^2$? edited body Mar26 revised How to draw the graph of $x^6 = y^3$ and $3y = (log x)^2$? deleted 5 characters in body Mar14 revised Prove that $n^2$ tends to infinity as $n$ tends to infinity mathjax added; Mar14 revised Does the square or the circle have the greater perimeter? A surprisingly hard problem for high schoolers mathjax added; Mar8 revised Can every even integer greater than four be written as a sum of two twin primes? mathjax added; Mar8 revised To determine number of arrangements of 4 letters in a word so that the transitions remains conserved mathjax added; Mar8 revised Solve a system of differential equations where argument of one function depend at another argument mathjax added; Mar8 revised Size of the product of two subgroups mathjax added; Mar8 revised Bijection from $\mathbb{N} \to \mathbb{N}$ mathjax added; Mar8 revised How one can show $P(ax+n|x)=P(n)$? Title edited;