You need to use Susan's Formula

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Solve this problem ! 1+2+3+4+...............+1000 ?

2271313 100100 500500 400500

Vega Gigir by Vega Gigir , 23, Indonesia

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3 solutions

Sravanth C.
Mar 11, 2015

Use this formula! n × ( n + 1 ) 2 \frac { \quad n\times (n+1)\quad }{ 2 }

6 Helpful 0 Interesting 0 Brilliant 0 Confused

thank you for give me suggestion ;) i'm already know that formula. i just trying to make some new

Vega Gigir - 6 years, 3 months ago
Frankie Fook
Mar 12, 2015

Consider this 1000+1=1001,999+2=1001,thus consider 1001 as pattern and multiply 1001 by 500,that's the answer!

2 Helpful 0 Interesting 0 Brilliant 0 Confused

yeah , its also a good suggestion and can be usefull. thanks

Vega Gigir - 6 years, 3 months ago
Vega Gigir
Mar 11, 2015

by mattew manangka

2 Helpful 0 Interesting 0 Brilliant 0 Confused

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