MBA Exam

Four circles with radii 5, 5, 8, a are mutually externally tangent. Then the value of a is

1) 8/9
2) 2/3
3) 16/9
4) 14/9

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MBA Other Question

There are 10 different houses.In how many ways can a thief steal from 3 houses such that he cannot choose two immediate neighbors

1) 54
2) 64
3) 128
4) none of the above
Let N = 999 999 999 999 999 999. How many 9's will be there in N^2?

1) 15
2) 17
3) 19
4) 21