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.

What is the value of (4a2 + 8b + 14c + 2)/2 ?

If (1 + sinA)/cosA + cosA/(1 + sinA) = x, then the value of x is

If (1/4 of x) - (4/5 of 6/7) equals - 9/7, then value of x is

What is the HCF of 36, 72 and 126?

The length of one side and the diagonal of a rectangle are 5 cm and 13 cm respectively. Find its area (in cm2).

G is the centroid of the equilateral triangle ABC, if AB = 9cm then AG is equal to

The height of a tower is 50√3 m. The angle of elevation of a tower from a distance 50 m from its feet is