( \frac{(n+4)!}{(n+2)!} ) का सही विस्तार कौन सा है?
Which is the correct expansion of ( \frac{(n+4)!}{(n+2)!} )?
Explanation opens after your attempt
B. ( (n+4)(n+3) )
Concept
((n+4)!=(n+4)(n+3)(n+2)!), so only two factors remain. Do not add an extra ((n+2)).
Why this answer is correct
The correct answer is B. ( (n+4)(n+3) ). ((n+4)!=(n+4)(n+3)(n+2)!), so only two factors remain. Do not add an extra ((n+2)).
Exam Tip
((n+4)!=(n+4)(n+3)(n+2)!), इसलिए केवल दो गुणक बचते हैं। अनावश्यक ((n+2)) न जोड़ें।
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