1, 4, 9, 16, 25?

2, 4, 12, 48, 240,?

192, 021, 222, 324, 252, 627, 2_, 9_?

3, 7, 6, 5, 9, 3, 12, 1, 15, ?

3, 6, 18, 72, ?

24, 60, 120, 210, ?

Directions: In the following question four words have been given, out of which three are alike in some manner and the for one is different. Choose out the odd one.
Triangle
Rectangle
Circle
Square 

Direction: In the following question, select the related letters from the given alternatives.
Book : Pages : : Ladder : ?