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

How much is the sum of natural numbers from (31) to (40)?

Answer and explanation

Correct answer: 355

There are 10 numbers from 31 to 40, inclusive. They form an arithmetic progression, so the sum is \\(\frac{10}{2}(31+40)=5\times71=355\\). Getting 345 indicates an error in counting the terms or using the last term. Exam tip: When finding the sum over an inclusive range, count both endpoints.

Related tags

Arithmetic ProgressionNatural NumbersSum Of SeriesInclusive RangeClass 9 MathematicsSum Of First N Natural NumbersSequences And ProgressionsMathematics

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.