MBA Exam

7/b + 8/a = -1 , where a and b are non zero integers . For how many values of (a,b) is (a+b) positive?Do post your approach as well.

1) 4
2) 6
3) 7
4) 8

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MBA Other Question

A certain college has a circular wall around it with four gates pointing north,south, east and west. A bar stands outside the city, 3kms north of the north gate, and it can just be seen from a point 9kms east of the south gate. What is the diameter of the wall that surrounds the city?

1) 6km
2) 9km
3) 12km
4) None of these
Largest integer n, for which n + 11 divides n^3 + 331 is

1) 189
2) 239
3) 489
4) None