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

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

Adam1994Best ResponseYou've already chosen the best response.0
I 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
 2 years ago

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

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

ngocthi0101Best ResponseYou've already chosen the best response.0
i can prove formula
 2 years ago

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

ngocthi0101Best ResponseYou've already chosen the best response.0
no, sum sequense have formula, not step by step
 2 years ago

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

ngocthi0101Best ResponseYou've already chosen the best response.0
ok, i know a litle english
 2 years ago

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

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

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

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