Probability as favourable over total outcomes
For equally likely outcomes, probability of an event equals favourable outcomes divided by total outcomes.
Practice This ConceptMain explanation
Teacher explanation
This is the working rule used in most Class 10 questions. The event may be getting an even number, a red ball, a heart card, or any other result we want. The key is to count only the outcomes that satisfy the event and divide by the full sample space.
Example
If a die is thrown, the probability of getting an even number is 3/6 = 1/2.
Simple analogy
Event count over total count.
Common confusion
Students sometimes count favourable outcomes correctly but forget to count the full sample space.
Exam tip
Write the event first, then count only matching outcomes before dividing by the total.
Answer writing and exam use
1-mark use
Write the exact meaning of probability as favourable over total outcomes in one clean line.
2-mark use
Define probability as favourable over total outcomes and add one example or condition.
3-mark use
Explain probability as favourable over total outcomes, show the method or example, and mention the common mistake.
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