Question

Ayuda por favor en sumatorias:(​

Answer 1

Los valores son los siguientes; ∑ = - 7/3 y a₃ =  27

Siendo:

∑ {para i = 1 a 6] [(a₁ – 5]/3]

∑ {para i = 1 a 6] = (1 - 5)/3 + (2 - 5)/3 + (3 - 5)/3 + (4 - 5)/3 + (5 - 5)/3 + (6 - 5)/3

∑ {para i = 1 a 6] = (- 4)/3 + (- 3)/3 + (- 2)/3 + (- 1)/3 + (0)/3 + (1)/3  

∑ {para i = 1 a 6] = - 4/3 - 3/3 - 2/3 - 1/3 + 1/3  

∑ {para i = 1 a 6] = (- 4 - 3 - 2 - 1 + 1)/3  

Ahora la función es:

∑ {para i = 1 a n]  an = 2n² + 3n

Hallar a₃.

a₃ = 2(3)² + 3(3)

a₃ = 2(9) + 9

a₃ = 18 + 9

a₃  = 27