Math 54
Professor K. A. Ribet
Midterm Exam
September 28, 2005
This exam was an 50minute exam. It began at 2:10PM. There were 3 problems, for which
the point counts were 6, 16 and 8. The maximum possible score was 30. I anticipate that
this will be an easy exam. (I’m writing these words three hours before the test.)
Please put away all books, calculators, electronic games, cell phones, pagers, .mp3
players, PDAs, and other electronic devices. You may refer to a single 2sided sheet
of notes. Your paper is your ambassador when it is graded. Correct answers without
appropriate supporting work will be regarded with great skepticism. Incorrect answers
without appropriate supporting work will receive no partial credit. This exam has six
pages. Please write your name on each page. At the conclusion of the exam, please
hand in your paper to your GSI.
1.
Find the inverse of the matrix
0
1
0
0
0
3
2

1

1
1
0
0

1
1
1
0
.
I presume that everyone will do this by Gaussian elimination. The answer should be
1
0

1
0
1
0
0
0
0
0

1
1
3
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 Spring '08
 WILKENING
 Math, Linear Algebra, Gaussian Elimination, Invertible matrix, Identity matrix, invertible square matrix

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