Number System
Letters of the word SERIES are arranged in such a way that all the vowels always come together. What is the total number of ways of making such an arrangement ?

36
112
72
98

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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 ?

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

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Number System
The sum of the digits of a two-digit number is 15 and the difference between the digits is 3. What is the two-digit number?

78
Cannot be determined
96
69

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