101年 - 101 國立交通大學_碩士班考試入學試題_電機工程學系：線性代數與機率#105746

(a) (3%) Suppose Ax = b is a consistent system and v₁ and v₂ are two solutions, where A is an m X n matrix. Then v = v₁ - V₂must be a solution for the homogeneous equation Ax = 0.

(b) (3%) Let A and B be m x n matrices. If Ax = Bx for all x

, then A and B are equal.

(c) (3%) Let A be an n X n matrix. If A is invertible, then any subset of

formed by the columns vectors of A is linearly independent.

(d) (3%) Let S =

be a subset of

and T :

be a linear transfor- mation. When

is linear independent, S is not necessarily linearly independent.

(e) (3%) Let A be an m x n matrix. If the number of pivot numbers of A is less than m, then Ax = b has more than one solution.

2. (10%) Let W₁, W₂,... ,

be subspaces of

such that

is a subset of

is the orthogonal complement of

, for i = 1,2, ,m - 1. Suppose the orthogonal projection matrix for

. Determine the orthogonal projection matrix for V =

3.(a) (8%) Find the eignevalues and eigenvectors for

(b) (3%) How can you tell whether a matrix is invertible from its eigenvalues?

(c) (3%) How can you tell whether two matrices are similar from their eigenvalues?

4. (a) (8%) For the following matrix, find the bases for its row space and nullspace.

(b) (3%) In R³, is xy plane orthogonal to xz plane ? Explain it.

5. (12%) Let random variable X be uniformly distributed in [-2,2]. Find , the probability density function of Y = X² for y＞0.

6. (13%) Let X and Y be independent exponentially distributed random variables with common parameter λ. Find the probability density function of Z = X+Y.

(a) (10%) Find the marginal PMF of X in terms of N and C.

(b) (5%) If N=3, find C.

(c) (10%) If N=3 and Z= X(N-X), find , the PMF of Z, for all z.

101年 - 101 國立交通大學_碩士班考試入學試題_電機工程學系：線性代數與機率#105746

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