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
1/12
1/10
1/16

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Number System
In a five-litre mixture of milk and water the portion of water is 30%. How much milk should be added to the mixture so that the portion of water reduces to 5% ?

17 litre
29 litre
25 litre
21 litre

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