(5) अलग-अलग घंटियों को (5) निर्धारित स्थानों पर लगाने के तरीके कितने हैं?
In how many ways can (5) different bells be placed at (5) fixed positions?
Explanation opens after your attempt
B. (120)
Concept
(5) different bells can be placed at (5) positions in (5!=120) ways. Arrangements at fixed positions use factorial.
Why this answer is correct
The correct answer is B. (120). (5) different bells can be placed at (5) positions in (5!=120) ways. Arrangements at fixed positions use factorial.
Exam Tip
(5) अलग घंटियाँ (5) स्थानों पर (5!=120) तरीकों से लगेंगी। निर्धारित स्थानों की arrangement factorial से होती है।
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