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mathmath333
 one year ago
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mathmath333
 one year ago
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mathmath333
 one year ago
Best ResponseYou've already chosen the best response.1In Arithmetic Progression \(\large \color{black}{\begin{align} S_{15}=150, \ S_{25}=200 ,\ S_{n}=0,\ n=?\hspace{.33em}\\~\\ \end{align}}\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0God its been a while since I have done this I would be no help to you sorry

hartnn
 one year ago
Best ResponseYou've already chosen the best response.2so you know the sum of Arithmetic series formula ?

mathmath333
 one year ago
Best ResponseYou've already chosen the best response.1\(n/2\left(2a+(n1)d\right)\)

hartnn
 one year ago
Best ResponseYou've already chosen the best response.2so with the given data, can we form 2 equations in 2 unknowns and solve for 'a' and 'd' ?

hartnn
 one year ago
Best ResponseYou've already chosen the best response.2150 = 15 (a+ 7d) 200 = 25 (a+ 12d) right ?

hartnn
 one year ago
Best ResponseYou've already chosen the best response.2so what values did u get for a and d ?

hartnn
 one year ago
Best ResponseYou've already chosen the best response.2for Sn = 0 2a+(n1)d = 0 [because n can't be 0]

mathmath333
 one year ago
Best ResponseYou've already chosen the best response.1dw:1434473688893:dw
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