Respuesta :

Answer:

Step-by-step explanation:

a1=7

a2=13

c.d. d=13-7=6

an=a1+(n-1)d

an=7+(n-1)6=7+6n-6=6n-1

recursive formula

c.d .=an-a(n-1)

6=a_{n}-a_{n-1}

a_{n}=a_{n-1}+6

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