Quantitative Aptitude - Arithmetic Ability Questions

In the following question, four groups of three numbers are given. In each group the second and third number are related to the first number by a Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

In the following question, four groups of three numbers are given. In each group the second and third number are related to the first number by a Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

If tan θ + sec θ = (x – 2)/(x + 2), then what is the value of cos θ?

What is the value of a2 + b2a3 - b3, when a + b = 8 and a - b = 2?

If the angles of a triangle are in the ratio of 2 : 5 : 8, then find the value of the largest angle.

A well of diameter 3 m and depth 14 m is dug. The earth, taken out of it, has been evenly spread all around it in the shape of a circular ring of width 4 m to form an embankment. Find the height of embankment?

Which of the following is equivalent to 0.565656...?

The slope of the line passing through the points (2,-1) and (x,5) is -1. Find x?