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a₁ = 25/24
a₇ = 12/5
d = ?
Calculamos.
a₇ = a + (n - 1) * d
12/5 = 25/24 + (7 - 1) * d
12/5 = 25/24 + 6d
12/5 - 25/24 = 6d
6d = 12/5 - 25/24----sacas el mcm de los denominadores = 120
288 - 125
6d = ---------------
120
6d = 163/120
d = 163/120/6/1
d = 163/720
Respuesta
d = 163/720