Number System
Which of the following number is divisible by 4 and 9?

2368
3814
2736
3954

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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 ?

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

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Number System
The difference between a two-digit number and the number obtained by interchanging its two digits is 45. The sum of the digit of the number is 9. What is the product of the two digits of the number?

15
13
14
12

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