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For the poset ({2,4,6,9,12,18,27,36,48,60,72},|) having the `divides’ relation, find

(a) the maximal elements

(b) the minimal elements

(c) All upper bounds of {2,9}

(d) The least upper bound of {2,9} if it exists.
What is a partially ordered set? Prove that the inclusion relation `is a subset of’ is a partial ordering on the power set of a finite set S.
Use generating functions to solve the recurrence relation a_k=5a_(k-1)-6a_(k-2) with the initial conditions a_0=6 and a_1=30.
Use generating functions to solve the recurrence relation a_k=3a_(k-1)+4^(k-1) with the initial condition a_0=1.
Find the solution of the recurrence relation a_n=4a_(n-1)-4a_(n-2)+(n+1).2^n.
Find the solution of the recurrence relation a_n=2a_(n-1)+〖3.2〗^n.
Find all solutions of the recurrence relation a_n=5a_(n-1)-6a_(n-2)+2^n+3n.
Find the general form of the solutions of the recurrence relation a_n=8a_(n-2)-16a_(n-4).
Solve the recurrence relation a_n=-3a_(n-1)-3a_(n-2)-a_(n-3) with a_0=5,a_1=-9,and a_2=15.
Solve the recurrence relationa_n=6a_(n-1)-12a_(n-2)+8a_(n-3) with a_0=-5,a_1=4,and a_2=88.
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