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

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

User Brian Garson
by
7.8k points

1 Answer

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

User Peter Baer
by
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