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Material Type: Assignment; Class: Problem Seminar; Subject: Mathematics; University: University of Michigan - Ann Arbor; Term: Fall 2006;
Typology: Assignments
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Math 289 โ Fall 2006 โ Problem Set 11
Due November 22, 2006
1.(10) Find a number divisible by 2 and 49 which has exactly
a) 22 divisors, b) 23 divisors.
2.(10) Determine a, b so, that (for polynomials)
(x โ 2)^2 divides ax^4 + bx^3 + 2.
3.(15) For every n โ N, find the largest integer k for which
2 k^ divides b(3 +
11)^2 nโ^1 c.
4.(20) Does there exist a function f : R โ R with the following properties:
(a) f is unbounded at every finite interval (a, b) but it is bounded on any bounded set of rational numbers?
(b) f is strictly increasing and is continuous at every irrational number but dis- continuous at every rational number?
(c) f is strictly increasing and is continuous at every rational number but discon- tinuous at every irrational number?