In an examination of mathematics, 2 students from college A, 30 students from college B, and 40 students from college C appeared. Only, 15 students from each of the college could get through the examination. Out of them 10 students from college A and 15 students from college B and 10 students from college C secured full marks.

a)Write down the above data in form of matrix.

b)Calculate the cofactors from the matrix data.

c)Find the adjoint matrix