Quantitative Aptitude - Arithmetic Ability Questions

Find out the odd word/letters/number pair from the given alternatives

If 3x^2 + ax + 4 is perectly divisible by x - 5, then the value of a is :

What is the value of [(sin x + sin y) (sin x – sin y)]/[(cosx + cosy) (cosy – cosx)]?

What least number must be added to 213, so that the sum is completely divisible by 9?

ΔABC is right angled at B. If m∠C = 60°, then find the value of (cotA - 1/2).

What is the reflection of the point (2, 3) in the line y = 4?

If a3 + 3a2 + 9a = 1, then what is the value of a3 + (3/a)?

Let ΔABC and ΔABD be on the same base AB and between the same parallels AB and CD. Then the relation between areas of triangles ABC and ABD will be