defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Determinants Application of Determinants
If the system of linear equations :
x + y + 2z = 6,
2x + 3y + az = a + 1,
–x – 3y + bz = 2b,
where a, b ∈ R, has infinitely many solutions, then 7a + 3b is equal to :
1
9
2
12
3
16
4
22