Quantitative Aptitude - Arithmetic Ability Questions

In the following question, four number pairs are given. The number on left side of (–) is related to the number on the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given options.

If secA/(secA ­- 1) + secA/(secA + 1) = x, then x is

If 5(4 - x) - 4 > 5x -2 > 2x - 6, then the value of x is

4 + 16 x -12 x 24 - 13 - 3 ÷ 20 - 4 = ?

What is the sum of the first 13 terms of an arithmetic progression if the first term is -10 and last term is 26?

Which value among 53, 64,126,27612 is the largest?

The angle of elevation of the top of a tower from a point A on the ground is 30°. On moving a distance of 20 metres towards the foot of the tower to a point B, the angle of elevation increases to 60°. The height of the tower in meters is

Compute 4923 / 547 - 10