Skip to content

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

Class 9 Mathematics Sequences and Progressions Sum of first n natural numbersExpertLevel 59

If (S_n-S_{n-1}=154) and (S_m=7503), what is (n-m)?

Answer and explanation

Correct answer: (31)

First (n=154), and (S_m=7503) gives (m=122), so (n-m=32). The difference of consecutive sums gives the index.

Tags

mathsequencesnatural-numberssum

Frequently asked questions

What is the correct answer to this question?

(31)

Why is this the correct answer?

First (n=154), and (S_m=7503) gives (m=122), so (n-m=32). The difference of consecutive sums gives the index.

Which subject and chapter does this question cover?

This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Sum of first n natural numbers.

Report question