Problem Set 11 Questions - Problem Seminar | MATH 289, Assignments of Mathematics

Material Type: Assignment; Class: Problem Seminar; Subject: Mathematics; University: University of Michigan - Ann Arbor; Term: Fall 2006;

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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)
(xโˆ’2)2divides ax4+bx3+ 2 .
3.(15) For every nโˆˆN, find the largest integer kfor which
2kdivides b(3 + โˆš11)2nโˆ’1c.
4.(20) Does there exist a function f:Rโ†’Rwith the following properties:
(a) fis unbounded at every finite interval (a, b) but it is bounded on any bounded
set of rational numbers?
(b) fis strictly increasing and is continuous at every irrational number but dis-
continuous at every rational number?
(c) fis strictly increasing and is continuous at every rational number but discon-
tinuous at every irrational number?

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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 โˆ’ 2)^2 divides ax^4 + bx^3 + 2.

3.(15) For every n โˆˆ N, find the largest integer k for which

2 k^ divides b(3 +

11)^2 nโˆ’^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?