Answer: n!.
- A n
- B n²
- C n!
- D 2<sup>n</sup>
Correct answer: C. n!
Explanation: A bijection from A to A is a permutation. First element maps to n choices, second to n-1, and so on. By multiplication principle: n×(n-1)×...×1 = n! permutations. Alternatively, |A|=n so bijections = n!. Answer: n!
Concept context
Ordered pairs, Cartesian products, types of relations and functions, domain and range. Foundation for calculus and Class 12 algebra.