4道数学概率题， 高手请进，谢谢

Each of the numbers from 1 through 10 is written on a slip of paper and the slips are placed in a covered bowl. The bowl is shaken and one slip of paper is drawn at random. Specify:
1.the probability of getting an even number and the odds in favor of getting an even number.
2.the probability of getting a number less than 5 and the odds in favor of getting a number less than 5.

Each of the 10 letters A through J is written on a slip of paper and the slips are placed in a bag. The bag is shaken and one slip is drawn at random. Specify:
3.the probability of drawing a vowel and the odds in favor of drawing a vowel.
4.the probability is not drawing a vowel and the odds in favor of not drawing a vowel.

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