Compute 1 + 2 + 3 +....+ 1,997 + 1,998 + 1,999

asked Feb 14, 2023 92.0k views

5 votes

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4 votes

Answer:

1 999 000

Explanation:

Formula:

$1+2+3+.\ .\ .+n=(n* \left( n+1\right) )/(2)$

………………………………………

Then

$1+2+3+....+1997+1998+1999=(1999* \left( 1999+1\right) )/(2)$

$1+2+3+....+1997+1998+1999=(1999* \left( 2000\right) )/(2)$

1+2+3+....+1997+1998+1999=(3998000 )/(2)

1+2+3+....+1997+1998+1999=1999000

Peter Baer answered Feb 20, 2023

3.1k points

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