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]

Answer Link

Otras preguntas

are inverse functions? f(x) = 1 3 x − 8, g(x) = 3x + 2
fill in the blanks, solve x2+6x +y2- 4y = 23
4. Is y = 6 a linear equation? Explain.
Help,anyone can help me do quetion a and b.​
What produces magnetic fields?​
what promise did Anil make to the thief boy​
Please solve both with explanation, I’ll give brainliest
When 20 grams of KCIO3, is dissolved in 100 grams of water, the solution can be described as.............if the solubility equals 53.3g/100g H20. a. Saturated c
Rearrange the formula to make x the subject. y = 4x + 3
Turn the following sentences into the passive1.They are opening a new restaurant this evening.2.Someone saw you in the bank3.A lot of men enjoy football.4.Did t