true

Take Class 10 Tuition from the Best Tutors

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

Search in

How to add 1+2+3+4+....+100

Akhilesh Choudhary

09/03/2017 1 0

Simple trick

Let X=1+2+3+...+100

Now add same series in reverse order as

100+99+98+........+1 = X

Now 2X = 101+101+101+101+......100times

So 2X= 101*100

2X= 10100

X=5050

This formula comes like this = n(n+1)/2 where n is the last number of the series

1 Like 0 Dislike

Follow 0

Other Lessons for You

various terms associated with a convex mirror

1) Principal focus : The principle focus of a convex mirror is the point on its principal axis to which a beam of light rays, initially parallel and close to the axis, appears to diverge after being reflected...

Debraj Paul

0 0

Linear magnification of a mirror

Linear magnification of a mirror is the ratio of height of the image to the total height of the object, thus, Linear magnification = Height of Image Height of Object If “h1” be the height...

Debraj Paul

0 0

Difference Between Water and Alcohol

1.Water exists in three distinctive states, solid (ice), liquid (water) and gaseous (steam or vapor). But alcohol exists only in the single liquid state.2.Water is a molecular substance while alcohol is...

Debraj Paul

0 0

Formation of water molecule (H2O)

Each hydrogen atom has only one electron in its outermost shell. Therefore, each hydrogen atom required one more electron to achieve the stable configuration of helium (nearest noble gas). The oxygen atom...

Debraj Paul

0 0

How To Overcome Exam Pressure?

Exam pressure is something that everyone faces atleast once in their lifetime. It is a psychological fact that generates a fear in us at the time of any exam or any other opportunity. Most of us finds...

Ankit Khurana

0 0

Find Class 10 Tuition near you

Online Tuition Class 10

Looking for Class 10 Tuition ?

Learn from Best Tutors on UrbanPro.

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you

Class 10 Tuition Questions

What should be the internet speed and mode to take online classes , like on skype or yahoo messenger...

78 Answers

How much you can concentrate on subject, not tuition fee?

16 Answers

What is indeterminate form? Please explain.

101 Answers

I am ready to take tuition classes for Commerce Subjects. How to enlist the students ?

10 Answers

How many types of Loans are there?

5 Answers

Looking for Class 10 Tuition Classes?

The best tutors for Class 10 Tuition Classes are on UrbanPro

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

Take Class 10 Tuition with the Best Tutors

The best Tutors for Class 10 Tuition Classes are on UrbanPro

I am a Student I am a Tutor
Name*	Please enter your full name. Please enter institute name.
Email*	Please enter your email address.
Phone*	Please enter a valid phone number.
Location*	Please enter a pincode or area name.
City*	Please enter city name.
Category*	Please enter category.
Gender*	Male Female Please select your gender.
Email ID/ Mobile No.*	Please enter either mobile no. or email.
Enter Password*	Please enter OTP Please enter Password Sorry, this phone number is not verified, Please login with your email Id.