Number System
If a number is multiplied by. three-fourth of itself, the value thus obtained is 10800. What is that number ?

60
120
260
180

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Number System
A box contains 5 red, 4 black and 4 blue balls. If 3 balls are drawn randomly from the box, what is the probability that there are exactly 2 blue balls in the three drawn balls ?

28/144
29/145
27/143
30/146

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Number System
If the letters of the word PREVIOUS be arranged at random, what is the probability that all the vowels come together ?

1/16
1/10
1/12
1/14

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