9c
Chat with our AI personalities
(4 x 9) + (5 x 9) = (9 x 9)c= 81
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; }
The sum of 1 + 8 is 9.
the sum is the answer to an addition problem e.g.4+5=9 9 is the sum
The sum of 8, 11 and 9 is 28.