Finding the value of K
88184
Finding the value of $k$ for parallel/orthogonal planes
50552
find functions that $f(m+k)=f(mk-n)$
94831
Finding value of $a +b+c$
112253
How to find sums like $\sum_{k=0}^{39} \binom{200}{5k}$
130664
Find value of infinite product
44701
How to find maximum $x$ that $k^x$ divides $n!$
20619
Finding Rational numbers
60061
Find the value of : $\lim_{n\to\infty}\prod_{k=1}^n\cos\left(\frac{ka}{n\sqrt{n}}\right)$
140877
Evaluate the sum $\sum_{k=1}^n {n \choose k-1} {n \choose k}$
94784
$\sum_{k=-m}^{n} \binom{m+k}{r} \binom{n-k}{s} =\binom{m+n+1}{r+s+1}$ using Counting argument
108689
closest integer value
144148
Find the value of $P(1)$
61324
Finding the "square root" of a permutation
113517
How to find the kth largest element in an unsorted array of length n in O(n)?
115433
Find the summation of given expression: $\sum_{k=1}^n k^3\binom nk$
54442
Sum of $k {n \choose k}$ is $n2^{n-1}$
46622
Let $ Y = \{ (1,1),(0,0\} \subset \mathbb A_k^2$. Find the $ \mathbb I(Y)$.