Which R command creates a 2 by 2 matrix with the values 1,2,3 and 4?

If [{:(1,-3,2),(2,-8,5),(4,2,lambda):}] is not an invertible matrix, then what is the value of lambda ?

If [{:(1,-3,2),(2,-8,5),(4,2, lamda):}] is not an invertible matrix, then what is the value of lamda

If the matrix P = [(7,a,4),(-1,3,b),(c, 6, 2)] is a symmetric matrix then the respective values of a ,b,c are

If A=[[2,-2,-4],[-1,3,4],[1,-2,-3]] then A is 1) an idempotent matrix 2) nilpotent matrix 3) involutary 4) orthogonal matrix

If A=[[2,-2,-4],[-1,3,4],[1,-2,-3]] then A is 1) an idempotent matrix 2) nilpotent matrix 3) involutary 4) orthogonal matrix

Let A=[(2, -1, 1),(-2, 3, -1),(-4, 4, -x)] be a matrix. If A^(2)=A , then the value of x is equal to

If A = ({:( 1,2,3),( 2,1,2),( 2,2,1) :}) and A^(2) -4A -5l =O where I and O are the unit matrix and the null matrix order 3 respectively if , 15A^(-1) =lambda |{:( -3,2,3),(2,-3,2),(2,2,-3):}| then the find the value of lambda

If A=[(1,-2,1),(2,lambda,-2),(1,3,-3)] be the adjoint matrix of matrix B such that |B|=9 , then the value of lambda is equal to