Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

What is the value of ( \frac{14!}{11!}-3\cdot\frac{13!}{11!} )?

Answer and explanation

Correct answer: (1716)

Factorial quotients are easiest to evaluate by expanding only the factors that do not cancel. Since \(14!=14\times13\times12\times11!\), dividing by \(11!\) leaves \(14\times13\times12\). The same idea applies to the second quotient, allowing the expression to be evaluated without large factorials.

The first term is \(\frac{14!}{11!}=14\times13\times12=2184\). The second part is \(3\cdot\frac{13!}{11!}=3\cdot(13\times12)=3\cdot156=468\). Subtracting gives \(2184-468=1716\). Therefore option B is correct. The factor 3 multiplies the entire second quotient; it is not part of the factorial denominator and must be applied after simplifying that quotient.

Related tags

PermutationsCombinationsFactorialExpert

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.