Muft Shiksha
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
Class 9MathematicsSequences and ProgressionsSum of first n natural numbersHardLevel 62
0 reads0 ratings0 helpful

If the sum of the first (n) natural numbers is (3655), what is the value of (n)?

Advertisement

Answer and explanation

Correct answer: (85)

(S_{85}=\frac{85\times86}{2}=3655), so (n=85). Match (2S_n) with the product of consecutive numbers.

Related tags

MathSequencesNatural-NumbersSum

Frequently asked questions

What is the correct answer to this question?

(85)

Why is this the correct answer?

(S_{85}=\frac{85\times86}{2}=3655), so (n=85). Match (2S_n) with the product of consecutive numbers.

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.

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

KEEP PRACTISING

10 more MCQs
  1. 1Let A = {x : x is a natural number and x < 4}. What is A?
  2. 2What will be the 9th term in the sequence (3, −6, 12, −24, …)?
  3. 3If (a=10) and (d=2), what will be the sum of the first (6) terms?
  4. 4If a = 7 and d = 3, what is the sum of the first 6 terms?
  5. 5What is the sum of the first 6 terms of the arithmetic progression (15, 21, 27, 33, ...)?
  6. 6What is the sum of the first (10) natural numbers?
  7. 7Find the sum of the first (20) natural numbers.
  8. 8If \(S_n=\frac{n(n+1)}{2}\), what is \(S_{15}\)?
  9. 9What is the value of (1+2+3+\cdots+25)?
  10. 10Which is the sum of the first (30) natural numbers?
Advertisement