69 20
Choose the correct answer in Exercise 17 to 19.
17. If a, b, c, are in A.P. then the determinant
1x+
2x+3x+2a)
(x+3x+4 x 4 26
1x + 4 x+5 x+20
(A) 0
(B) 1
(C) x
(D) 2x
18. If x,y,z are nonzero real numbers, then the inverse of matrix A=0
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