hobileme hobileme
  • 24-04-2018
  • Mathematics
contestada

Find the sum of last ten terms of the AP : 8, 10, 12,...., 126.

Respuesta :

THEBRAINLY2
THEBRAINLY2 THEBRAINLY2
  • 24-04-2018
For finding, the sum of last ten terms, we write the given AP in reverse order i.e, 126, 124, 122,..., 12, 10, 8

Hence,first term (a) = 126, common difference, (d) = 124 - 126

So, [tex]S _{10} = \frac{10}{2} [ 2a + (10 - 1)d ] \: [/tex]
[tex] = 5 [2(126) + 9( - 2) ] [/tex]
[tex] = 5(252 - 18)[/tex]
[tex] = 5 \times 234 = 1170[/tex]
Answer Link

Otras preguntas

Which of the following objectives was not a goal of the war on terror? a. to gain control of the oil reserves in Iraq b. to combat international terrorist organ
pueden existir orbitales con la misma energía?
any 1 bored here ???1. ​
2) April 11, 1803: Louisiana Purchase In 1682, France's Sierra de la Salle claimed the Louisiana Territory for France without regard for the thousands of Native
. _________ are the smallest level of organization and are known as the building blocks of matter.
Describe the government's Reservation policies towards Native Americans.
Jean wants to make a fitness goal based on a skills-related component of health. What is the MOST appropriate goal for him to make? O to improve his muscular en
How would i solve for X? Please help!
how many mb is in 8byte​
Tell me where you have found examples of foreshadowing in Romeo and Juliet. What do they mean?