SOLUTION: Find the sum of the sequence. 39 + 40 + 41 + 42 + ... + 122 The sum is __.

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Question 894515: Find the sum of the sequence.
39 + 40 + 41 + 42 + ... + 122
The sum is __.

Answer by AakarshM(2) About Me  (Show Source):
You can put this solution on YOUR website!
You can write this in sigma.
84
SUM (38 + k) = 3192 + SUM k
k=1
= 3192 + 42(85) = 3192 + 3570 = 6762