#HITECH MATHEMATICAL PROBLEMS #12TH MATHS EXERCISE 1.7 IN TAMIL #12TH MATHS SOLVED EXERCISE PROBLEMS #EXERCISE 1.7 PROBLEM 3 #TAMIL EXPLANATION #12TH MATHS CHAPTER 1 EXERCISE PROBLEMS WITH CLEAR EXPLANATION #APPLICATIONS OF MATRICES AND DETERMINANTS PROBLEMS #BY USING GAUSSIAN ELIMINATION METHOD BALANCE THE CHEMICAL REACTION