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x1+ x1+3 + x1+ 6 = 13
3x1 = 4
x1 = 4/3
x2= 4/3+ 3 = 13/3
x3 = 4/3 + 6 = 22/3
..
x1x2 + x2x3 + x1x3 = m
m = (4/3)(13/3) + (13/3)(22/3) + (4/3)(22/3)
m = (52 + 286+88)/(9)= 426/9 = 142/3
n = x1x2x3 = 1.144/27