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CBSE Class 11-science Answered

is this a right one
Asked by mridulbhardwaj | 23 Apr, 2010, 01:16: PM
answered-by-expert Expert Answer

Dear Student

Sum of first n natural numbers is 1+2+3+..........+n = [(n(n+1)]/2

using n = n-2 we have
1+2+3+..........+(n-2) = [(n-2) (n-1)]/2

So your statement is correct

Regards
Team Topperlearning

Answered by | 23 Apr, 2010, 02:01: PM
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