08-08-2020
Mathematics

contestada

Find the sum of the even numbers between 199 to 1999

Respuesta :

konrad509 konrad509

08-08-2020

[tex]S_n=\dfrac{n(a_1+a_n)}{2}\\a_1=200\\a_n=1998\\n=?\\\\a_n=a_1+(n-1)d\\d=2\\1998=200+(n-1)\cdot2\\2n-2=1798\\2n=1800\\n=900\\\\S_{900}=\dfrac{900\cdot(200+1998)}{2}=450\cdot 2198=989100[/tex]

Answer Link

Otras preguntas

The Han dynasty lasted from 206 B.C. To 9 A.D. How many years did the dynasty last? Years (Hint: Think of the years in B.C. And A.D. As part of a number line, i

The millionaire who controlled the valuable train line from new york to Chicago

25 points for answering the Brainliest. Explain how the struggles of Odysseus to reach Ithaca are a contest between Poseidon and Athena as well.

Francisco Zuniga is a former president of coasts rica who won the Nobel prize in 1987

Which of the following words does not describe Mr. Pravat in this passage?

Which two numbers have a least common multiple of 60? A. 12 and 15 B. 6 and 10 C. 6 and 15 D. 6 and 12

what is this polynomial 12x^6+8x^4

Meg has a total total of d dollars in her checking account. She makes a cash deposit of c dollars and a deposit of three checks each worth s dollars. She would

Write the fraction as the product of a whole number and. Unit fraction 2/5

A class made equal teams of 5 for basketball, and equal teams of 6 for vollyball. Each in the class was on a team. How many students might be in the class?