Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd letter/letters from the given alternatives.

The value of (1 - √2) + (√2 - √3) + (√3 - √4) + ..... + (√15 - √16) is

If 4 + 3x ≤ 6 + x and 3x + 5 > 2 + 2x; then x can take which of the following values?

If tan ­-5π/3 = x, then the value of x is

If XY = a+23 and YX = 13, then find the value of X2 + Y2X2 - Y2.

Select the odd word/letters/number/number pair from the given alternatives.

Three solid spheres of radius 3 cm, 4 cm and 5 cm are melted and recasted into a solid sphere. What will be the percentage decrease in the surface area?

What is the reflection of the point (5 , -1) in the line y = 2?