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An= a1+(n-1)d
A30= -28+(30-1)d
30= -28 +29d
58= 29d
d= 58/29
d=2
14= -28+(n-1)2
14= -28+2n-2
14= -30+2n
44= 2n
n= 22
Respuesta: Tuvo 22 aciertos y se equivocó en 8