Asked by Ernest edet
The fifth term of an exponential is 4375 and the second term is 35, find
i) the 3 term
ii) the sum of the first five terms
i) the 3 term
ii) the sum of the first five terms
Answers
Answered by
oobleck
wrong yet again! t5/t2 = r^3, so
r^3 = 125
r = 5
t3 = t2 * r = 35 * 5 = 175
t1 = t2/r = 35/5 = 7
S5 = t1*(r^5-1)/(r-1) = 7(5^5-1)/(5-1) = 5467
r^3 = 125
r = 5
t3 = t2 * r = 35 * 5 = 175
t1 = t2/r = 35/5 = 7
S5 = t1*(r^5-1)/(r-1) = 7(5^5-1)/(5-1) = 5467
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