Given the language $L=\{w\in\{a,b\}^*\mid\text{$w$ has an odd quantity of $a$ and even quantity of $b$}\}$ answer
40030
FA that accepts odd number of $b$ and even number of $a$
2900
How many $3$-subsets of $\{1,2,\ldots,10\}$ contain at least one even and one odd integer?
48838
Proving the number of $n$ length binary strings with no consecutive $1's$ $b_n$ is equal to $b_{n-1} + b_{n-2}$
86926
Why isn't this a well ordering of $\{A\subseteq\mathbb N\mid A\text{ is infinite}\}$?
96380
Representation of $\text{sl}(2,\mathbb{C})$
15300
How to show that $(W^\bot)^\bot=W$ (in a finite dimensional vector space)
50266
In the following figure prove that: $AK||BC$
156727
A step in the proof of Characterization of $W^{1,\infty}$
80892
Does $\wp(A \cap B) = \wp(A) \cap \wp(B)$ hold? How to prove it?
2771
A group has odd number of elements iff each element is a square, $a=b^2$.
129693
An interesting problem with "decomposing" natural numbers.
103538
Partitions of $n$ into distinct odd and even parts proof
102721
Number of elements in the ring $\mathbb Z [i]/\langle 2+2i\rangle$
126020
pumping lemma: ww^R not regular
86858
Prove that the set of palindromes are not regular languages using the pumping lemma.
12100
$n \mid (a^{n}-b^{n}) \ \Longrightarrow$ $n \mid \frac{a^{n}-b^{n}}{a-b}$
68882
Path to Combinatorics Problem [$1.11$]