1.  x - 3y + 4 = 0

2.  2x - y + 3 = 0

4.  x + 2y - 1 = 0

1.  A.P.

2.  H.P.

4.  None

1.  

2.  

3.  

1.  5 units

2.  6 units

4.  8 units

1.  x a x-1 - x b x-1

3.  log (b/a)

4.  does not exist

1.  there is only one root

3.  there are only three distinct roots

4.  there are four distinct roots

1.  0

2.  6

3.  64

1.  4th term

2.  5th term

4.  7th term

1.  0

3.  8

4.  16

1.  π/2

2.  π/3

3.  π/4