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Midterm2

# Midterm2 - books remain to be put on the last shelf On the...

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CS 182 – Fall 2009 Name: Prof. Ananth Grama MIDTERM #2 This is an open book, open notes exam. However, you are not allowed to share any material with anyone else during the exam. Any evidence of academic dishonesty will be dealt with strictly in accordance with existing rules at Purdue University. The exam consists of 7 questions on the following 7 pages. Each question is worth 10 points. Problem Maximum Score 1 10 2 10 3 10 4 10 5 10 6 10 7 10 Total 70

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PROBLEM 1 A pseudorandom numbers generator is using the following linear congruence 𝑥 𝑛 +1 = 29 𝑥 𝑛 mod 13 . a. (6 pts) If the first generated number is 𝑥 1 = 4, what is the seed 𝑥 0 ? b. (4 pts) Determine the sequence of pseudorandom numbers generated up to 𝑥 5 . 2
PROBLEM 2 Express the gcd(116,164) as a linear combination of 116 and 164. Does the inverse of 164 mod 116 exist? 3

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PROBLEM 3 Find all solutions of the congruence equation 31 𝑥 3 mod 17. 4
PROBLEM 4 You want to organize your books on shelves. When you put 5 books on each shelf, only 2

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Unformatted text preview: books remain to be put on the last shelf. On the other hand, the last shelf will only contain 1 book if you put 6 or 7 books on each of the other shelves with all shelves containing the same number of books. How many books do you have? 5 PROBLEM 5 a. (4 pts) Convert (23 . 875) 10 to binary. Show your work. b. (6 pts) Carry out the following operations in binary number system: i. (3 pts) 110001 . 01 − 1011 . 11. ii. (3 pts) 1111 × 10101. 6 PROBLEM 6 Using less than 8 divisions determine whether the number 293 is prime. Show your work. 7 PROBLEM 7 a. (5 pts) Use Fermat’s Little Theorem to ﬁnd 7 62 mod 13. b. (5 pts) Show that 1 ° + 2 ° + 3 ° + ⋅⋅⋅ + ( ° − 1) ° ≡ 0 mod ° for any prime ° > 2. ( Hint : ∑ ± ² =1 ± = ² ( ² + 1) / 2) 8...
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