1,-1, 1, -1,1,-1,…… up to 131 terms, then `S_(131)` =

Prove that the line joining (1,2,3),(2,1,-1) intersects the line joining (-1,3,1) and (3,1,5) .

If A= [[-1,2,3],[5,7,9],[-2,1,1]] and B= [[-4,1,-5],[1,2,0],[-1,3,1]] then verify that (A-B)^T = A^T-B^T

If A= [[3,1,1],[1,3,1],[1,1,3]] , then show that |3A| = 27 |A| .

If A= [[-1,2,3],[5,7,9],[-2,1,1]] and B= [[-4,1,-5],[1,2,0],[-1,3,1]] then verify that (A+B)^T=A^T +B^T

If A = {:[(-1,2,3),(5,7,9),(-2,1,1)] and B = [(-4,1,-5),(1,2,0),(1,3,1)] , then show that (A +B) = A'+B'

If A = [[-1,2,3],[5,7,9],[-2,1,1]] andB = [[-4,1,-5],[1,2,0],[1,3,1]] , then verify that (A+B)' = A' + B'

If A = [[-1,2,3],[5,7,9],[-2,1,1]] and B = [[-4,1,-5],[1,2,0],[1,3,1]] , then verify that (A-B)' = A' - B'

If the origin is the centroid of the tetrahedron for which (2,-1,3) ,(-1,3,1) ,(3,4,-2) are three vertices then the fourth vertex is