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Babynini
 one year ago
A partial sum of an arithmetic sequence is given. Find the sum.
1+5+9+...+401
Babynini
 one year ago
A partial sum of an arithmetic sequence is given. Find the sum. 1+5+9+...+401

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Babynini
 one year ago
Best ResponseYou've already chosen the best response.1a=1, d=4 Sn=(n/2)(a1+a2) I'm not sure how to plug in these numbers though!

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1@jim_thompson5910 :) do you have time?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1it should be Sn = (n/2)(a1 + an)

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1an = a1 + d(n1)

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1First you need to find n

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1an = a1 + d(n1) 401 = 1 + 4(n1) n = ??

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1a1 = 1 an = 401 n = 101 Sn = (n/2)*(a1 + an)

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1I got the same

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1wolfram agrees http://www.wolframalpha.com/input/?i=1%2B5%2B9%2B...%2B401

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1haha yay! the wolfram stamp of approval x) thanks so much.
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