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It is question about series topic geometric series?

1 Answer

May 20, 2018

# r = -2/7 #

Explanation:

#s_oo = a/(1-r) # for #|r| < 1 #

#=> (3a)/(1-r) = (a)/(1-(-2r) ) #

#=> 3/(1-r) = 1/(1+2r) #

#=> 3 + 6r = 1 - r #

#=> r = -2/7 #

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