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r= An-A1/n-1
r= 514-111/32-1
r= 403/31
r= 13
Segunda parte:
An= A1 + (n-1) (r)
An= 111 + (20-1) (13)
An= 111 + (19) (13)
An= 111 + 247
An= 358
Rpta: 358.