MBA Exam

Say there is a number system with only 8 or 9 as digits and all possible 10 digits numbers are formed . How many number has two consecutive 9's ?

1) 888
2) 900
3) 1024
4) 880

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MBA Other Question

Find the real solutions to x, y & z if : log10(2000xy) - log10x log10y = 4, log10(2yz) - log10y log10z = 1, log10zx - log10z log10x = 0.

1) None of these
2) (1, 5, 1), (100, 20, 100)
3) (10, 4, 3), (100, 20, 100)
4) (1, 5, 1), (120, 25, 120)
A cube of edge 12 cm is cut into 64 equal cubes. All the cubes
are now arranged on a table such that one face of each cube touches the
table. The resulting figure is a solid cuboid whose length and breadth
are in the ratio 4 : 1 respectively. What is the total surface area of
the table occupied by the cuboid?

1) 144sq.cm
2) 288sq.cm
3) 576sq.cm
4) none of these