1+2+3+4+5+6+7+8+9......+99999999999+100000000000
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1+2+3+4+5+6+7+8+9......+99999999999+100000000000 =[(1+100000000000) * 100000000000]/2 =100000000001 * 50000000000 =5000000000050000000000
((1+100000000000)*100000000000)/2 =5000000000050000000000
5000000000050000000000
a=1 d=100000000000 T(n)=1+(n-1)100000000000 T(n)=1+100000000000n-100000000000 T(n)=-99999999999+100000000000n -100000000000n=-99999999999 n=0.99999999999 S(n)=n/2[2a+(n-1)d] S(0.99999999999)=0.99999999999/2[2*1+(0.99999999999-1)100000000000] S(0.99999999999)=0.499999999995[2+(-0.00000000001)100000000000] S(0.99999999999)=0.499999999995
(1+100000000000)x 100000000000 /2
600000 x 100000000000
5000050000
((1+100000000000)*100000000000)/2 =5000000000050000000000
5000000000050000000000
a=1 d=100000000000 T(n)=1+(n-1)100000000000 T(n)=1+100000000000n-100000000000 T(n)=-99999999999+100000000000n -100000000000n=-99999999999 n=0.99999999999 S(n)=n/2[2a+(n-1)d] S(0.99999999999)=0.99999999999/2[2*1+(0.99999999999-1)100000000000] S(0.99999999999)=0.499999999995[2+(-0.00000000001)100000000000] S(0.99999999999)=0.499999999995
(1+100000000000)x 100000000000 /2
600000 x 100000000000
5000050000
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