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 43m reviewed Approve Permutations and Combinations based probblem 1d answered How many ways are there to distribute 26 identical balls into six distinct boxes such that… Apr 25 answered how to solve this nested summation? Apr 25 comment how to solve this nested summation? what is a meaning of $pos=1$ Apr 17 revised Find the original price if the price after reduction by $15\%$ and subsequent increase by $5\%$ is $1606.60$ euro added 83 characters in body Apr 16 revised Find the original price if the price after reduction by $15\%$ and subsequent increase by $5\%$ is $1606.60$ euro added 21 characters in body Apr 16 answered Find the original price if the price after reduction by $15\%$ and subsequent increase by $5\%$ is $1606.60$ euro Mar 18 revised Prove algebraically that ${n\choose k}=\frac{n(n-1)…(n-k+1)}{1\cdot 2\cdot …\cdot k}$ added 402 characters in body Mar 18 answered Prove algebraically that ${n\choose k}=\frac{n(n-1)…(n-k+1)}{1\cdot 2\cdot …\cdot k}$ Mar 18 revised How many ways can N objects be split into groups of 3? added 2 characters in body Mar 18 revised Find Nth formula of recursive formula $a_n=a_{n-1}+n(n-1)a_{n-2}$ deleted 4 characters in body; edited title Mar 8 reviewed Approve methods to solve $(13+x)^{1/4}+(4-x)^{1/4}=3$. Mar 8 answered How to write a sum that only includes even terms? Mar 8 revised Are my solutions true?(Set-theory) added 4 characters in body Mar 8 reviewed Approve Solve integral $\int \frac{dx}{( \sin x + 2 \cos x )^3}$ Mar 6 revised Proof by induction: Show that $9^n-2^n$ for any $n$ natural number is divisible by $7$. added 19 characters in body Feb 26 answered Prove that $6$ divides $n^3+11n$? Feb 25 revised Factoring $({16+4t^2+\frac{t^4}{4}})^{1/4}$ deleted 19 characters in body Feb 24 comment Factoring $({16+4t^2+\frac{t^4}{4}})^{1/4}$ In the finish of answer you must replace $u=t^2/2$ Feb 24 answered Factoring $({16+4t^2+\frac{t^4}{4}})^{1/4}$