The sum of 1 + 8 is 9.
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The sum of 1 and 7 is 8. That is, 1 + 7 = 8
8 and 1 8+1=9 8*1=8
There is no sequence of adds or subtracts of 5, 6, 8, 9, and 10 that sum to 1. Check it with this C++ code... for (int i=0; i<32; ++i) { int sum = 0; if (i&1) sum += 5; else sum -= 5; if (i&2) sum += 6; else sum -= 6; if (i&4) sum += 8; else sum -= 8; if (i&8) sum += 9; else sum -= 9; if (i&16) sum += 10; else sum -= 10; cout << i << " " << sum << endl; }
0.125
The sum of 7 and -8 is -1.