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91Ó°ÊÓ

Find the least upper bound of the sequences in Exercises 37–42

2-1k2

Short Answer

Expert verified

The east upper bound is2.

Step by step solution

01

Step 1. Given information.

The given series is2-1k2.

02

Step 2. Upper bound.

Now, we can write,

limk→∞ak=limk→∞2-1k2=limk→∞2-limk→∞1k2=2

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Most popular questions from this chapter

Prove Theorem 7.25. That is, show that the series ∑k=1∞akand∑k=M∞akeither both converge or both diverge. In addition, show that if ∑k=M∞akconverges to L, then∑k=1∞akconverges tolocalid="1652718360109" a1+a2+a3+....+aM-1+L.

Leila finds that there are more factors affecting the number of salmon that return to Redfish Lake than the dams: There are good years and bad years. These happen at random, but they are more or less cyclical, so she models the number of fish qkreturning each year as qk+1=(0.14(−1)k+0.36)(qk+h), where h is the number of fish whose spawn she releases from the hatchery annually.

(a) Show that the sustained number of fish returning in even-numbered years approach approximately qe=3h∑k=1∞0.11k.

(Hint: Make a new recurrence by using two steps of the one given.)

(b) Show that the sustained number of fish returning in odd-numbered years approaches approximately qo=6111h∑k=1∞0.11k.

(c) How should Leila choose h, the number of hatchery fish to breed in order to hold the minimum number of fish returning in each run near some constant P?

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