WGU C959 DISCRETE MATHEMATICS
ACTUAL QUESTIONS AND VERIFIED
ANSWERS EXAM PREP
◉ What is a matrix? Answer: A rectangular array of numbers or
expressions arranged in rows and columns. (Section 4.1)
◉ How is the size of a matrix expressed? Answer: As m × n, where m
is the number of rows and n is the number of columns. (Section 4.1)
◉ How is the entry in row i, column j of an m × n matrix A typically
written? Answer: As a_ij. (Section 4.1)
◉ What compact notation can be used to represent an entire matrix A,
with the size understood from context? Answer: The notation [a_ij].
(Section 4.1)
◉ Under what condition are two matrices considered equal? Answer:
The matrices must have the same size and the same corresponding
entries in every position. (Section 4.1)
◉ What is a diagonal entry of a matrix A? Answer: An entry a_ij
where the row index i equals the column index j. (Section 4.1)
, ◉ What is the main diagonal of a matrix? Answer: The collection of
all the diagonal entries of the matrix. (Section 4.1)
◉ What is a zero matrix? Answer: A matrix in which all entries are 0.
(Section 4.1)
◉ Does a zero matrix need to be a square matrix? Answer: No, a zero
matrix can be of any size appropriate to the context, not necessarily
square. (Section 4.1)
◉ What is a column matrix? Answer: A matrix composed of a single
column, with size of the form m × 1. (Section 4.1)
◉ What is a row matrix? Answer: A matrix composed of a single row,
with size of the form 1 × n. (Section 4.1)
◉ What is a square matrix? Answer: A matrix that has an equal
number of rows and columns, with size n × n. (Section 4.1)
◉ What is a rectangular diagonal matrix? Answer: A matrix, not
necessarily square, in which all non-diagonal entries are 0. (Section
4.1)
◉ What is a diagonal matrix? Answer: A square matrix in which all
non-diagonal entries are 0. (Section 4.1)
ACTUAL QUESTIONS AND VERIFIED
ANSWERS EXAM PREP
◉ What is a matrix? Answer: A rectangular array of numbers or
expressions arranged in rows and columns. (Section 4.1)
◉ How is the size of a matrix expressed? Answer: As m × n, where m
is the number of rows and n is the number of columns. (Section 4.1)
◉ How is the entry in row i, column j of an m × n matrix A typically
written? Answer: As a_ij. (Section 4.1)
◉ What compact notation can be used to represent an entire matrix A,
with the size understood from context? Answer: The notation [a_ij].
(Section 4.1)
◉ Under what condition are two matrices considered equal? Answer:
The matrices must have the same size and the same corresponding
entries in every position. (Section 4.1)
◉ What is a diagonal entry of a matrix A? Answer: An entry a_ij
where the row index i equals the column index j. (Section 4.1)
, ◉ What is the main diagonal of a matrix? Answer: The collection of
all the diagonal entries of the matrix. (Section 4.1)
◉ What is a zero matrix? Answer: A matrix in which all entries are 0.
(Section 4.1)
◉ Does a zero matrix need to be a square matrix? Answer: No, a zero
matrix can be of any size appropriate to the context, not necessarily
square. (Section 4.1)
◉ What is a column matrix? Answer: A matrix composed of a single
column, with size of the form m × 1. (Section 4.1)
◉ What is a row matrix? Answer: A matrix composed of a single row,
with size of the form 1 × n. (Section 4.1)
◉ What is a square matrix? Answer: A matrix that has an equal
number of rows and columns, with size n × n. (Section 4.1)
◉ What is a rectangular diagonal matrix? Answer: A matrix, not
necessarily square, in which all non-diagonal entries are 0. (Section
4.1)
◉ What is a diagonal matrix? Answer: A square matrix in which all
non-diagonal entries are 0. (Section 4.1)
