Question

Progessions

Answer 1

The sum of the first n terms of an arithmetic progession is given by \[S_{n}=\frac{ 1 }{ 2 }(11n+3n ^{2})\]Find the first three terms of the progession.

Answer 2

@ganeshie8

Answer 3

@UnkleRhaukus

Answer 4

first
find the sum with n=3

Answer 5

\[S _{n}=30\] is it correct?

Answer 6

yeah

Answer 7

okay...next what should we do?

Answer 8

an arithmetic progression is triangles

Answer 9

hmm,

what is the the first term?

the first term must be for n=1

Answer 10

the sum of one term, is equal to that term!

Answer 11

okay, i get it...Thnx @UnkleRhaukus :)

Answer 12

and the area of the rectangle is 30