Which topics are the following questions from?

Which topics(in mathematics) are the following questions from?

Ok...we have this entrance exam which asked the following questions previous year. I don't even know which topics do these belong to.

Please tell me the following questions come under which category.

3. The value of (E – 1) is (where E is shift operator)

a) E –1 Δ b) E –1 ▽ c) E –1 δ d) None of these

29. In LPP ΔJ for all basic variables is equal to :

a) 1 b) –1 c) 0 d) None

37. If f (x) = 1/(x^2)

, then the value of divided difference f (a, b) is :

The value of Δ^10( 1-ax)(1-bx^2 )(1-cx^3 )(1-dx^4 )

is :

48. If U0 = 580, U1 = 556, U2 = 520 and U4 = 385, then the value of U3 is :

a) 400 b) 413 c) 465 d) 460

65. If U0 = 3, U1 = 12, U2 = 81, U3 = 200, U4 = 100 and U5 = 8, then the value of D 5U0

is:

a)700 b) 755 c) 756 d) None

68. The value of Δ^2O^5 is :

a) 20 b) 10 c) 30 d) 5

Thanks.

PS:- Since I didn't know the topics these questions belonged to, I posted it here. Sorry if its the wrong place.