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 Nice Question Question score of 10 or more. This badge can be awarded multiple times.

kuch nahi earned this badge 11 times

oct 15 at 3:15
Evaluate $ \binom{n}{0}+\binom{n}{2}+\binom{n}{4}+\cdots+\binom{n}{2k}+\cdots$
aug 10 at 0:58
Relation of this antisymmetric matrix $r = \left(\begin{smallmatrix}0 &1\\-1&0\end{smallmatrix}\right)$ to $i$
jun 17 '12 at 7:53
Quick way to expand $\cos^{-1}(\cos^2 x)$ up to $O(x^2)$
jan 12 '12 at 20:05
Puzzle: $(\Box @)+(\Box @) = (\Box\bigstar\Box$)
sep 22 '11 at 22:24
$S=1+10+100+100+10000+… = -1/9$? How is that
sep 19 '11 at 3:23
Evaluate $\sum\limits_{k=1}^n k^2$ and $\sum\limits_{k=1}^n k(k+1)$ combinatorially
aug 24 '11 at 10:03
Can I ever go wrong if I keep thinking of derivatives as ratios?
jul 30 '11 at 14:42
Do other non-native english speakers have trouble solving certain kinds of problems?
jun 24 '11 at 2:04
Math behind rotation in MS Paint
may 24 '11 at 12:42
How to understand and appreciate the prime number industry?
may 17 '11 at 5:22
$n$ lines cannot divide a plane region into $x$ regions, finding $x$ for $n$

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