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If ( \frac{(n+2)!}{n!}=90 ), what is the value of (n)?यदि ( \frac{(n+2)!}{n!}=90 ), तो (n) का मान क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (8)(8)
It gives ((n+2)(n+1)=90), and (10\cdot9=90), so (n=8). Recognizing consecutive factors is a quick method.यह ((n+2)(n+1)=90) देता है और (10\cdot9=90), इसलिए (n=8)। लगातार गुणकों को पहचानना तेज तरीका है।
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