If tan α = 2, then the value of   $$ {cosec^2 α - sec^2 α}\over{cosec^2 α + sec^2 α}   $$ is : 

From the given figures, select the figure in which the question figure is contained.

Three of the following four number-pairs are alike in a certain way and one is different. Find the odd one out.

Select the figure that will come next in the following figure series.

A shopkeeper has 11 books of same cost price. He sells the first book at certain price, then he sells second book at a price which is ₹ 1 less than the selling price of first book and then he sells third book at a price which is ₹1 less than the selling price of second book. Following this pattern, he sold all 11 books. If he sells sixth book at its cost price. Find the overall percent profit or loss on selling all 11 books. 

Find the number of triangles in the given figure.

Four dice positions are shown below. What number will be on the bottom panel if 1 is at the top?

Out of the given responses one of the factors of  (a²-b²)³+(b²-c²)³+(c²-a²)³ is