Same chapter3 marksDifficulty: Medium
If A has 3 elements and B has 4, how many relations and how many functions are there from A to B?
Relations and Functions
3 marksDifficulty: Medium
Find the domain of f(x) = √(x − 4).
Original Khojo Papers practice question — not from a past board paper.
Answer
x ≥ 4, that is the interval [4, ∞).
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The expression under a square root must not be negative for the value to be real.
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If A = {1, 2} and B = {a, b}, write A × B and state the number of relations from A to B.
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