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 \(\frac{22!}{20!\cdot 2!}-\frac{21!}{20!}\)?

Answer and explanation

Correct answer: 210

\(\frac{22!}{20!\cdot 2!}=\frac{22\times21}{2}=231\), while \(\frac{21!}{20!}=21\). Therefore, the value is \(231-21=210\). The value 231 represents only the first term, not the complete expression. Exam tip: cancel common factorial factors before performing the arithmetic.

Related tags

PermutationsCombinationsFactorialSimplificationBinomial-CoefficientsPermutations And CombinationsMathematicsClass 11 Mcq

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.