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## Answers

The Brainliest Answer!

so n =250

therefore ....

Sn=250(250+1)/2

=(250*251)/2

=31375

plz mark as d best...if it helped u..

*1st method:*

*Sn (Sum of the 'n' numbers) = n/2 (2a+(n-1)d)*

*given, n=250, a (1st number) = 1, d ( common difference) = 1*

*then,*

*Sn = 250/2 (2(1)+(250-1)1)*

*= 125(2+249)*

*= 125(251)*

*= 31375*

*therefore the sum of 1st 250 numbers = 31375*

*2nd Method:*

*Sn = n/2(a+l)*

*given, n=250, a=1, l (last term) = 250*

*Sn = 250/2 (1+250)*

*= 125(251)*

*Sn = 31375*

*3d Method:*

*Sum of 1st 'n' natural numbers = n(n+1)/2 [since given n=250]*

*= 250 (250+1)/2*

*= 125(251)*

*= 31375*

*therefore, the sum of 1st 250 numbers = 31375*