Asked by Aliza Asghar
find the sum to 5 term of the geometric progession whose first term is 54 and fourth term is 2.
Answers
Answered by
oobleck
r^3 = 2/54 = 1/27
so r = 1/3
and as always,
Sn = a(1-r^n)/(1-r)
so r = 1/3
and as always,
Sn = a(1-r^n)/(1-r)
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