CUET · MATHS · PYQ PAPER 2025
A and B are two sets such that n(A) = 5 and n(B) = 7. The number of one-one functions from A to B is
- A 35
- B 2150
- C 2520
- D 120
Answer & Solution
Correct Answer
(C) 2520
Step-by-step Solution
Detailed explanation
Number of one-one functions \( = P(n(B), n(A)) \) \( = P(7, 5) = \frac{7!}{(7-5)!} \) \( = \frac{7!}{2!} = \frac{5040}{2} \) \( = 2520 \)
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