Question

Find the sum of the arithmetic series:
3 + 5 + 7 + ... + 227

Answer 1

What does the "..." mean?

Answer 2

that there are other #'s in there

Answer 3

Ok trying to solve it

Answer 4

ok :)

Answer 5

Ok I got 12, 995

Answer 6

how?

Answer 7

a=3,d=5-3=2
tn=a+(n-1)d
227=3+(n-1)*2
227-3=2(n-1)
224/2=n-1
112+1=n
n=113
\[Sn=\frac{ n \left( a+l \right) }{ 2 }=\frac{ 113\left( 3+227 \right) }{2 }\]
solve and get the solution.

Answer 8

I guess I got 12,995 too

Answer 9

Ok. So I did this equation:


3 + 5 + 7 + ... + 227
2x1+1 + 2x2+1. + 2x3+1 +....+ 113x2+1
1x113+2(1+2+3...113)
113+2x(1/2)x(113x114)
113+113x114

Answer 10

u get same answer

Answer 11

continued...

113x(1+114)
113x115=
12,995

Answer 12

@music101 Yes I got the same answer.