Quantitative Aptitude - Arithmetic Ability Questions

If ( x - 5)2 + (y - 2)2 + (z - 9)2 = 0, then value of (x + y - z) is

If [a + (1/a)]2 – 2[a – (1/a)] = 12, then which of the following is a value of 'a'?

If 1/√(1 -­ sin2A) = x, then the value of x is

Coefficient of x2 in 4x3 - 2x2 + 2x -­ 3 are

A tetrahedron has 4 vertices. How many edges does it have?

Find the HCF & LCM of 16, 24.

If the value of √42 is approximately 6.480, then what is the approximate value of √(6/7)?

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.