UrbanPro
true

Take Class 12 Tuition from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Algebra (JEE - Main )

Sujoy Das
10/02/2018 0 0

Question:

A sequence of numbers is written in the following fashion: 1, 7, 1, 1, 7, 7, 1, 1, 1, 7, 7, 7, ... till ‘n’ terms. The sum of first 5001 terms of the given sequence is,

a) 5001 b) 20478 c) 19911 d) 39822

Answer:

n(n+1) = 5000, n = 70,

total = 1/2(70*71 + 7*70*71) + 31.

70 terms of 7 and of 1 plus 31 more terms

35*71*(7+1) =19880 + 31

= 19911

Sum has to be odd so A or C

But obviously sum > 5001

Hence C.

0 Dislike
Follow 2

Please Enter a comment

Submit

Other Lessons for You

Solution to a trigonometric problem requested by one student
∫ log x dx use integration by parts. Let u = log x. ∴ du = 1/x dx. and. dv = dx ∴ v= x By substituting u and dv in the formula ∫ u dv = u•v - ∫ v du ∫ log x...

Guarantee Of Profits To A Partner.
Guarantee is an assurance given to the partner of the firm that at least a fixed amount shall be given to him/her irrespective of his/her actual share in profits of the firm. If actual share in profits...

Introduction To Accounting: Part 13: Money Measurement Concept
According to the Money Measurement Concept, only those transactions and events are recorded in the books of accounts which can be measured in terms of money. Therefore, a transaction which cannot...

Consignment Accounts By CA Prashanth Reddy
A. INTRODUCTION When goods are sent by one person to another to be sold by the latter on behalf and at the risk of the former, the transaction is known as consignment. The person who sends the goods...

Java 9 , the new beginning
Java 9 is here! A major feature release in the Java Platform Standard Edition is Java 9 Lets see what more it offers more than its previous versions Java platform module JEP 223 : New version...
G

GCC

0 0
0
X

Looking for Class 12 Tuition Classes?

The best tutors for Class 12 Tuition Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Take Class 12 Tuition with the Best Tutors

The best Tutors for Class 12 Tuition Classes are on UrbanPro

This website uses cookies

We use cookies to improve user experience. Choose what cookies you allow us to use. You can read more about our Cookie Policy in our Privacy Policy

Accept All
Decline All

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more