in this triangle of six numbers, the value of each number in row two and in row three equals the positive difference between the two numbers immediately above it.for example, c equals b-a or a-b, whichever is positive.replace the letters a throught e with the numbers 1 throught 5 (once each) in a way that follows the above rules.what does c equal
đang được dịch, vui lòng đợi..