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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 $({16+4t^2+\frac{t^4}{4}})^{1/4}$