0 votes
195
The regular expression $(a^*+b)^*$ is equivalent to which of the following regular expressions: $a^*b^*$$(a^*b+b)^*$ $(a+b^*)^*$$(a^*b)^*$
0 votes
200
0 votes
207
How many paths are there in the plane from $(0,0)$ to $(m,n)\in \mathbb{N}\times \mathbb{N},$ if the possible steps from $(i,j)$ are either $(i+1,j)$ or $(i,j+1)?$$\binom...
0 votes
208