Same chapter3 marksDifficulty: Medium
Find the domain and range of f(x) = x2 + 1 for real x.
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2 marksDifficulty: Easy
If A = {1, 2} and B = {a, b}, write A × B and state the number of relations from A to B.
Original Khojo Papers practice question — not from a past board paper.
Answer
A × B = {(1, a), (1, b), (2, a), (2, b)}, and there are 24 = 16 relations from A to B.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
A relation from A to B is any subset of A × B, and A × B here has four elements.
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