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S = (a1 + an)n/2
625 = (31 + 94)n/2
1250 = 125n
10 = n
Hallamos "r"
tn = t1 + (n - 1)r
94 = 31 + (10 - 1)r
63 = 9r
7 = r
ESO ES TODO SALUDOS...............