Barhala
Barhala Barhala
  • 12-10-2020
  • Mathematics
contestada

What is the sum of the first 50 terms of the series 2 + 17 + 32 + 47+ ...?​

Respuesta :

gmany
gmany gmany
  • 12-10-2020

Answer:

[tex]\huge\boxed{18,475}[/tex]

Step-by-step explanation:

The terms of this sum make the arithmetic sequence.

The fomula of a sum of n terms of an arithmetic sequence:

[tex]S_n=\dfrac{[2a_1+(n-1)d]\cdot n}{2}[/tex]

We have

[tex]a_1=2\\d=17-2=32-12=47-32=15\\n=50[/tex]

Substitute:

[tex]S_{50}=\dfrac{[2\cdot2+(50-1)\cdot15]\cdot50}{2}=(4+49\cdot15)\cdot25=(4+735)\cdot25\\\\=739\cdot25=18,475[/tex]

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