Respuesta :

meerkat18
The series 11,8,5,2..... is an arithmetic progression with an arithmetic difference of -3. This is true because 11-3 is 8, 8 minus 3 is 5 and 5-3 is 2 and so on.. The formula of this arithmetic progression is equal to an = 11 -3(n-1) where an is the number at nth term. This is simplified to an = -3n + 4.  
kumikumika

Answer:

a_n = a_(n-1)-3; a_1 = 11 should be the answer

Step-by-step explanation:

recursive formula is a_n=a_(n-1)+d

in this problem d=-3 because it goes down by 3.

the person above me made an arithmetic formula for it which would be

a_n=-3n+14 not +4 which is wrong

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