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To sum the integers: 1 + 2 + 3 + 4 + 5 + . . . . . + 142 + 143 + 144 = ?
The 1st and last: 1 + 144 = 145
The 2nd and second-last: 2 + 143 = 145
The 3rd and third-last: 3 + 142 = 145
The 4th and fourth-last: 4 + 141 = 145
The 5th and fifth-last: 5 + 140 = 145
There are (144/2) = 72 pairs.
Each pair adds to 145.
The total is (72 x 145) = 10,440
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