MBA Exam

There are r rockets placed at the starting point of a track. The speed of each rocket is equal to twice the sum of the speeds of all the preceding rockets. If the 8th rocket covers the track in 3 minutes, then the time which the 6th rocket takes to cover the track is27 minutes. 9 minutes. 3 minutes. 81 minutes

1) a
2) b
3) c
4) d

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MBA Other Question
In a pack of cards, the probability that more then 48 cards have to be picked to get an ace is -

1) 1/52x51x50x49
2) 4!/52x51x50x49
3) 4/52!
4) 4/52x51x50x49
 If x^2 < 625 & |x + 8| < 31, how many values of x are perfect cubes of odd natural numbers?

1) 4
2) 1
3) 2
4) More than 4