MBA Exam

Ten books are arranged in a row on a bookshelf. A student has to select three out of these ten books in such a way that no two books selected by him must have been lying adjacently. In how many ways can he make the selection?

1) 56
2) 64
3) 72
4) NOT

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MBA Other Question

A train leaves delhi at 9 AM at a speed of 30 km/hr.another train leaves at 2 PM at a speed of 40 km/hr on the same day and in the same direction. how far from delhi, will the two trains meet?

1) 480 km
2) 520km
3) 600 km
4) 666.7 km
How many of the first 1200 natural numbers are either prime to 6 or to 15?

1) 380
2) 400
3) 420
4) 440