What is the answer to this sum:
1-2-3+4-5-6+7...-999
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The answer should be -499500 using the formula
n(n+1)/2
in the equation,the (+) sign has no value(no use) as (+)+(-)=(-).
therefore,
-((n(n+1)/2))
=-(999(999+1)/2)
=-(999*1000)
=-999000/2
=-499500
n(n+1)/2
in the equation,the (+) sign has no value(no use) as (+)+(-)=(-).
therefore,
-((n(n+1)/2))
=-(999(999+1)/2)
=-(999*1000)
=-999000/2
=-499500
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