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filas x columnas = n×n
total de personas: n^2 + 12........(1)
si coloca uno mas en la fila seria n+ 1
total de personas = (n+1)^2-17.......(2)
igualando (1) y (2)
n^2 + 12 = (n+1)^2 -17
28= 2n
n= 14
reemplazando n = 14 en (1)
=14^2 + 12 = 208 soldados