Book Maths Puzzle Numerical Ability

The circle O having a diameter of 2cm has a square inscribed in it. Each side of the square inscribed in it. Each side of the square is the then taken as a diameter to form 4 smaller circles O". Find the total area of all four O" circles which is outside the circle ).

A. 2

B. pi - 2

C. 2- pi/4

D. 2- pi/2

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Book Other Question

Find the number of ways you can fill a 3x3 grid (with 4 corners defined as a,b,c,d) if you have 3 white marbles and 6 black marbles

A. 9 C 3

B. 6 C 3

C. 9 C 3 + 6 C 3

D. (9 C 3) + (6 C 3)/3!
2,12,36,80,150,?