Find the sum of the series: (-50) + (-45) + (-40) + ... + 60 + 65 + 70 + 75.
Explanation:
Let S = (-50) + (-45) + (-40) + ... + 60 + 65 + 70 + 75
= (-50) + (-45) + (-40) + ... + 40 + 45 + 50 + 55 + 60 + 65 + 70 + 75
= 55 + 60 + 65 + 70 + 75
= 325
Hence, 325.
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