Respuesta :
abcdef... a - 1 = c, b+1 = d, e+1=c, f - 1 = d; b+c = a and a+b+c+d+e+f =30
b=1 and then d =2, then f = 3
a 1 c 2 e 3
9 1 8 2 7 3
b=1 and then d =2, then f = 3
a 1 c 2 e 3
9 1 8 2 7 3