Asked by Desiree
Use the terms to write an explicit equation.
a1 = 20; an+1 = ½ · an
a1 = 20; an+1 = ½ · an
Answers
Answered by
oobleck
Since r = a_n+1 / a_n, we have
a_n = a_1 * (a_n+1/a_n)^(n-1) = 20 * (1/2)^(n+1) = 40/2^n
a_n = a_1 * (a_n+1/a_n)^(n-1) = 20 * (1/2)^(n+1) = 40/2^n
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