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a = primero
a+1 = segundo
a+2 = tercero
(a) y (a+1), son los menores
(a+2), es el mayor
a^2+(a+1)^2=(a+2)+20
a^2+a^2+2a-a=2+20-1
2a^2+a-21=0
Factorizar :2a^2+a-21=0
(2a+7)(a-3)=0
2a+7 = 0
a =-7/2
a-3 = 0
a = 3
primero = 3
segundo = 4
tercero = 5
Res`puesta es: b)4