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Sequences word problems

Zhang Lei tracked the size of the bear population in a nature reserve. The first year, there were 10001000 bears. Sadly, the population lost 10%10\% of its size each year.
Let f(n)f(n) be the number of bears in the reserve in the nthn^\text{th} year since Zhang Lei started tracking it.
ff is a sequence. What kind of sequence is it?
Choose 1 answer:
Choose 1 answer:
Complete the recursive formula for f(n)f(n).
f(1)=f(1)=
f(n)=f(n1)f(n)=f(n-1)