The inverse of the matrix $$\left[ {\matrix{ 1 & 0 & 1 \cr { - 1} & 1 & 1 \cr 0 & 1 & 0 \cr } } \right]$$ is

The number of distinct simple graph with upto three nodes is

If A and B are real symmetric matrices of size n x n. Then, which one of the following is true?

The number of substrings (of all length inclusive) that can be formed from a character string of length $$n$$ is