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Mathematics 19 Online
OpenStudy (anonymous):

closed

OpenStudy (anonymous):

okay

hartnn (hartnn):

know the formula for n'th term of arithmetic sequence ?

OpenStudy (anonymous):

OpenStudy (anonymous):

okay

hartnn (hartnn):

a = first term = 5 d= common difference =-3 n = 5000 now try ?

OpenStudy (anonymous):

\[a _{5000} = 5 + (5,000-1) -3\]

OpenStudy (anonymous):

solve

hartnn (hartnn):

you missed the bracket \(a _{5000} = 5 + (5000-1) (-3)\)

OpenStudy (anonymous):

oh okay lol

OpenStudy (anonymous):

follow @hartnn equation

OpenStudy (anonymous):

mine has simple mathematical error

hartnn (hartnn):

thats correct answer 5000th term is -14992

hartnn (hartnn):

do you notice any pattern ?

hartnn (hartnn):

not actually, and this one is tricky, notice that every term is the SUM of 2 previous terms!

OpenStudy (anonymous):

oh so the answer is -7 then

hartnn (hartnn):

absolutely! :)

OpenStudy (anonymous):

thank you very much! :)

hartnn (hartnn):

welcome ^_^

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