Probabilities and Coincidence of Shared Birthdays Use a calculator to solve this exercise. Round probabilities to three decimal places. a. If two people are selected at random, the probability that they do not have the same birthday (day and month) is 365 365 . 364 365 . Explain why this is so. (Ignore leap years and assume 365 days in a year.) b. If three people are selected at random, find the probability that they all have different birthdays. c. If three people are selected at random, find the probability that at least two of them have the same birthday. d. If 20 people are selected at random, find the probability that at least 2 of them have the same birthday. e. Show that if 23 people are selected at random, the probability that at least 2 of them have the same birthday is greater than $$.
Probabilities and Coincidence of Shared Birthdays Use a calculator to solve this exercise. Round probabilities to three decimal places. a. If two people are selected at random, the probability that they do not have the same birthday (day and month) is 365 365 . 364 365 . Explain why this is so. (Ignore leap years and assume 365 days in a year.) b. If three people are selected at random, find the probability that they all have different birthdays. c. If three people are selected at random, find the probability that at least two of them have the same birthday. d. If 20 people are selected at random, find the probability that at least 2 of them have the same birthday. e. Show that if 23 people are selected at random, the probability that at least 2 of them have the same birthday is greater than $$.
Solution Summary: The author calculates the probability of three people selected at random having different birthdays.
1. The regular representation of a finite group G is a pair (Vreg, Dreg). Vreg is a vector space
and Dreg is a homomorphism.
(a) What is the dimension of Vreg?
(b) Describe a basis for Vreg and give a formula for Dreg. Hence explain why the homo-
morphism property is satisfied by Dreg.
(c) Prove that the character ✗reg (g) defined by tr Dreg (g) is zero if g is not the identity
element of the group.
(d) A finite group of order 60 has five irreducible representations R1, R2, R3, R4, R5. R₁
is the trivial representation. R2, R3, R4 have dimensions (3,3,4) respectively. What is the
dimension of R5? Explain how your solution is related to the decomposition of the regular
representation as a direct sum of irreducible representations (You can assume without proof
the properties of this decomposition which have been explained in class and in the lecture
notes).
(e) A
group element
has characters in the irreducible representations R2, R3, R4 given
as
R3
R2 (g)
= -1
X³ (g) = −1 ; XR4 (g) = 0…
Elementary and Intermediate Algebra: Concepts and Applications (7th Edition)
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