Question

20 If A,B,C,,...... are respectively the co-factors of the
elements xq, Y, Z,.... of the determinant
|X, Y, Z,
B, C
A = x2 Y2 Z2l, then equals to
B C₂
X3 Y3 Z3
(a) x,A.
(b)xx,
(c)(x, + y)A
(d) None of these
בה​

Answer 1

Answer:

From the property of determinants, if any element is multiplied with cofactor of corresponding element of another row, and summed up for each element of original row, the sum comes out zero ⇒(A)