Homework Help: Maths

Posted by Tejiri on Saturday, September 10, 2011 at 5:25pm.

A geometric progression has a third term of 20 band sum to infinity which is three times the first term. find the first term.

Maths - Mgraph, Saturday, September 10, 2011 at 10:06pm
B3=20
The sum=B1/(1-q)=3*B1 =>q=2/3
B3=B1*q^2
20=B1*4/9 =>B1=45

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