Question 308294
1. The outcomes in favor of the event are 2.
The outcomes against the event : 3
Total number of outcomes : 2+3=5
Probability for the event : 2/5.
Probability against the event: 3/5.
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2. the odds against the event are 5 : 1 
The outcomes against the event 5.
The outcomes for the event : 1
Total number of outcomes : 5+1=6
Probability for the event : 1/6.
Probability against the event: 5/6.
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3. The odds in favour of the event are 100 : 1 
The outcomes for the event : 100.
The outcomes against the event 1.
Total number of outcomes : 100+1=101
Probability for the event : 100/101.
Probability against the event: 1/101.
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I leave the 4th one for you. 
Follow the previous three examples. 
Re-post if you need help.