Number System
The sum of the digits of a two-digit number is 12, and the difference between the number and the number obtained by interchanging the two digits of the number is 18. Find the number.

25
50
75
12.5

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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
1/14
1/12

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