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Arithmetic and Geometric progressions.
by promise » Wed Feb 21, 2018 3:33 am
The population of a given community of birds after 3 years is 3million after 6years the population became 81million what is their first year population what is their 11th year population please help
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promise
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by Guest » Wed Feb 21, 2018 1:22 pm
It is a geometric progression with common ratio 3. third year the population was $ a_1q^2$
$a_13^2 =3$
$a_1 =3/9 million=1/3 million$
eleventh year was $\frac13*3^{10}$
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