A problem by Aditya Khatavkar
Level
pending
You have 41 terms in an Arithmetic Progression. The 21st term is 400. Find the sum of 41 terms.
The answer is 16400.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
let a be the first term and d the common difference given 21 st term is 400 a+20d= 400 the sum of 41 terms is given by n/2(2a+40d) =41/2(800)=16400