Number System
In a two-digit number, if it is known that its unit's digit exceeds its ten's digit by 2 and that the product of the given number and the sum of its digits is equal to 144, then the number is:

46
26
24
42

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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 ?

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

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