0 votes 0 votes The system of equations 3x1 – 12x2 + 6x3 + 9x4 = 0, 6x1 + 9x2 + 21x3 + 3x4 = 0, 3x1 + 27x2 + 6x3 = 0, –3x2 + 3x4 = 0 has (1) An unique solution (2) Infinite number of solutions (3) No solution (4) Exactly four solutions Mathematical Logic linear-algebra + – vishwa ratna asked Jan 19, 2017 vishwa ratna 353 views answer comment Share Follow See all 5 Comments See all 5 5 Comments reply santhoshdevulapally commented Jan 19, 2017 reply Follow Share is it A?? 0 votes 0 votes vishwa ratna commented Jan 19, 2017 reply Follow Share Answer given is Infinite solutions... 0 votes 0 votes santhoshdevulapally commented Jan 19, 2017 reply Follow Share it is homogeneous equation so no possibility of no solution. Determinant of 4x4 matrix is non zero and no of variables=4,so system having unique solution. Here Rank(A)=No of variables=4. 0 votes 0 votes vishwa ratna commented Jan 19, 2017 reply Follow Share I guess so, I also found rank =4 , so probably key is wrong. 0 votes 0 votes santhoshdevulapally commented Jan 19, 2017 reply Follow Share yes. 0 votes 0 votes Please log in or register to add a comment.