\({}^{7}P_{7}\) का मान क्या होगा?
What will be the value of \({}^{7}P_{7}\)?
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Correct Answer
A. (5040)
Concept
When (r=n), \({}^{n}P_{n}=n!\), so \({}^{7}P_{7}=5040\). Use factorial when all are selected.
Why this answer is correct
The correct answer is A. (5040). When (r=n), \({}^{n}P_{n}=n!\), so \({}^{7}P_{7}=5040\). Use factorial when all are selected.
Exam Tip
जब (r=n) हो तो \({}^{n}P_{n}=n!\), इसलिए \({}^{7}P_{7}=5040\)। पूरा चयन होने पर factorial लें।
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