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which term of the progression 0.004, 0.02, 0.1, …. Is 12.5?
T
n
= ar
n-1
, T
n
= 12.5, n=?
∴
⇒
⇒
⇒
⇒
n = 6
5
, Tn = 12.5, n=?
, Tn = 12.5, n=?