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- List the given numbers and units.
- Choose the formula that matches the asked value.
- Simplify carefully and compare with options.
Correct Answer: A
Correct Answer: A
Method / Topic: Probability
The answer follows from the arithmetic relation between the given values.
Short Explanation
Detailed Explanation
Correct Answer: A
Method / Topic: Probability
Identify the sample space and the favourable outcomes. For independent events multiply their probabilities; for a complement use 1 - P(E).
Count the favourable outcomes and the total equally likely outcomes. Applying the appropriate probability rule gives P(E) = 1/4.
CHECK:
The obtained probability lies between 0 and 1, and the favourable-outcome count is consistent with the stated experiment.
EXAM TIP:
Before calculating, decide whether the
Do not treat dependent draws without replacement as independent events, and do not forget to reduce the final fraction.
PRACTICAL EXAMPLE:
Probability compares the number of outcomes satisfying an event with the complete set of possible outcomes.
Therefore, the correct probability is 1/4.
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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Shortcut used, common trap, and the fastest solving route
- List the given numbers and units.
- Choose the formula that matches the asked value.
- Simplify carefully and compare with options.
When 2 fair coins are tossed, probability of exactly 0 heads
Explanation
Correct Answer: A
Method / Topic: Probability
The answer follows from the arithmetic relation between the given values.
Short Explanation
Detailed Explanation
Correct Answer: A
Method / Topic: Probability
Identify the sample space and the favourable outcomes. For independent events multiply their probabilities; for a complement use 1 - P(E).
Count the favourable outcomes and the total equally likely outcomes. Applying the appropriate probability rule gives P(E) = 1/4.
CHECK:
The obtained probability lies between 0 and 1, and the favourable-outcome count is consistent with the stated experiment.
EXAM TIP:
Before calculating, decide whether the
Do not treat dependent draws without replacement as independent events, and do not forget to reduce the final fraction.
PRACTICAL EXAMPLE:
Probability compares the number of outcomes satisfying an event with the complete set of possible outcomes.
Therefore, the correct probability is 1/4.
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