Asked by Godwin Mandela
The third,fourth and fifth terms of GP are t+4 ,t+10 and t+20 respectively. Determine the common ratio,first term and sum of the 12terms
Answers
Answered by
oobleck
find t using (t+10)^2 = (t+4)(t+20)
having t, r = (t+10)/(t+4)
a = (t+4)/r^2
S12 = a(r^12-1)/(r-1)
having t, r = (t+10)/(t+4)
a = (t+4)/r^2
S12 = a(r^12-1)/(r-1)
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