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Adam1994
 2 years ago
find the sum of the arithmetic sequence having the data given.
a1 = 5, an = 3, n = 20
Adam1994
 2 years ago
find the sum of the arithmetic sequence having the data given. a1 = 5, an = 3, n = 20

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Chlorophyll
 2 years ago
Best ResponseYou've already chosen the best response.1Do you know which formula to apply?

Adam1994
 2 years ago
Best ResponseYou've already chosen the best response.0I have no idea, I missed a few days of class and I came back to a whole new lesson. Kinda just tryin to get caught up right now

Chlorophyll
 2 years ago
Best ResponseYou've already chosen the best response.1S_n = n ( a_1 + a_n ) / 2

Chlorophyll
 2 years ago
Best ResponseYou've already chosen the best response.1Do you know how to plug in?

ngocthi0101
 2 years ago
Best ResponseYou've already chosen the best response.0i can prove formula

Chlorophyll
 2 years ago
Best ResponseYou've already chosen the best response.1Just go step by step!

ngocthi0101
 2 years ago
Best ResponseYou've already chosen the best response.0no, sum sequense have formula, not step by step

Chlorophyll
 2 years ago
Best ResponseYou've already chosen the best response.1@Adam1994 pls let me know a1?

ngocthi0101
 2 years ago
Best ResponseYou've already chosen the best response.0ok, i know a litle english

Chlorophyll
 2 years ago
Best ResponseYou've already chosen the best response.1Would you double check this problem, I believe it's wrong!

Chlorophyll
 2 years ago
Best ResponseYou've already chosen the best response.1Since n = 20 => we're looking for S_20

Chlorophyll
 2 years ago
Best ResponseYou've already chosen the best response.1S_20 = 20 ( a_1 + a_20 ) / 2

Chlorophyll
 2 years ago
Best ResponseYou've already chosen the best response.1Anyway, this is the formula for arithmetic Sum, just memorize it for your own benefit!
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