What is the sum of 1+2+3........n
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Sum of 1+2+3+.........n= n(n+1)/2
laxmipriyabhoi:
n(n+1)/2
Answered by
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Sn=n/2{2a+(n-1)d}
=n/2{2+(n-1)*1}
=n/2{2+(n-1)}
=n/2{2+(n-1)*1}
=n/2{2+(n-1)}
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