give the proper answer for the question number 61 for 10 CBSE in arithmetic progression lesson in maths
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to find the sum of first n positive integers is
n(n+1)divided by 2
n(n+1)divided by 2
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direct answer...[n(n+1)]/2
...otherwise if told to show by formula...u can try like in the attachment...
...otherwise if told to show by formula...u can try like in the attachment...
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anirudhe2004:
hey you explained it by proof
yes..bt any prblm?.. smtyms its tld to show in xms...thts y i did so...
ok
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