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67+8+9+42 = 126
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The sum of 10 plus 8 is 18.
42 + 25 + 8 = 75
4+8 =12
It is: 8+1+7 = 16
The sum of the numbers given is 31. 1 + 2 + 4 + 8 + ... + 2n = 2n+1 - 1