({}^{n}C_r\cdot r!(n-r)!) हमेशा किसके बराबर होता है?
What is ({}^{n}C_r\cdot r!(n-r)!) always equal to?
Explanation opens after your attempt
Correct Answer
B. (n!)
Concept
Choose (r) objects first, then arrange both chosen and unchosen lists. In exams factorial cancellation also gives this quickly.
Why this answer is correct
The correct answer is B. (n!). Choose (r) objects first, then arrange both chosen and unchosen lists. In exams factorial cancellation also gives this quickly.
Exam Tip
पहले (r) वस्तुएं चुनें, फिर चुनी और न चुनी दोनों सूचियों को क्रम में रखें। परीक्षा में factorial cancellation से भी यही तुरंत मिलता है।
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