MBA Exam

7 Mathematics books are arranged in a row on a table. A person is removing those books one by one. Then what is the probability that all those books are removed without having a break in that row of books?

1) 1
2) 2/7
3) 4/315
4) 1/315

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MBA Other Question
Navjivan Express from Ahmedabad to Chennai leaves Ahmedabad at 6:30 am and travels at 50 km per hour towards Baroda situated 100 kms away. At 7:00 am Howrah – Ahmedabad express leaves Baroda towards Ahmedabad and travels at 40 km per hour. At 7:30 Mr. Shah, the traffic controller at Baroda realises that both the trains are running on the same track. How much time does he have to avert a head-on collision between the two trains?

1) 15 minutes
2) 20 minutes
3) 25 minutes
4) 30 minutes
 Let T be the set of integers {2, 12, 22, 32 ..., 542, 552} and S be a
subset of T such that the sum of no two elements of S is divisible by 3.
The maximum possible number of elements in S is

1) 18
2) 19
3) 20
4) 21