01․ A square matrix is called singular if its

If the determinant of a square matrix is zero, then it does not have a matrix inverse. That means the matrix is said to be singular.

02․ If the solution of quadratic equation x

^{2}-11x+22 are x=3 and x=6, then the base of the number isWe know if a and b is the solution of a quadratic equation then we can write the equation as
x

^{2}- (a + b )x + ab = 0 By comparing this equation with the given equation ab = 2n + 2 Given a = 6 & b = 3 so, 18 = 2n + 2 → n = 81