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QUESTION 1 1. Reformulate Equation (2.1), removing the restriction that a is a nonnegative integer. That is, let a be any integer. Path: p Words:0 10 points QUESTION 2 1. For each of the following equations, find an integer x that satisfies the equation. a) 5x ≡ 4 (mod 3) b) 7x ≡ 6 (mod 5) c) 9x ≡ 8 (mod 7) 30 points QUESTION 3 1. Determine the GCD of the following; a) gcd(24140, 16762) b) gcd(4655, 12075) 20 points QUESTION 4 1. Using Fermat's theorem to find a number x between 0 and 28 with x85 congruent to 6 modulo 29. (You should not need to use any brute-force searching.) 10 points QUESTION 5 1. Use Euler's theorem to find a number a between 0 and 9 such that a is congruent to 71000 modulo 10. (Note: This is the same as the last digit of the decimal expansion of 71000). 10 points QUESTION 6 1. Prove the following: If p is prime, then φ(p1) = pi – pi-1. Hint: What numbers have a factor in common with pi? Path: p Words:0 10 points QUESTION 7 1. Six professors begin courses on Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday, respectively, and announce their intentions of lecturing at intervals of 2, 3, 4, 1, 6, and 5 days, respectively. The regulations of the university forbid Sunday lectures (so that a Sunday lecture must be omitted). When first will all six professors find themselves compelled to omit a lecture? Hint: Use the CRT.

QUESTION 1 1. Reformulate Equation (2.1), removing the restriction that a is a nonnegative integer. That is, let a be any integer. Path: p Words:0 10 points QUESTION 2 1. For each of the following equations, find an integer x that satisfies the equation. a) 5x ≡ 4 (mod 3) b) 7x ≡ 6 (mod 5) c) 9x ≡ 8 (mod 7) 30 points QUESTION 3 1. Determine the GCD of the following; a) gcd(24140, 16762) b) gcd(4655, 12075) 20 points QUESTION 4 1. Using Fermat's theorem to find a number x between 0 and 28 with x85 congruent to 6 modulo 29. (You should not need to use any brute-force searching.) 10 points QUESTION 5 1. Use Euler's theorem to find a number a between 0 and 9 such that a is congruent to 71000 modulo 10. (Note: This is the same as the last digit of the decimal expansion of 71000). 10 points QUESTION 6 1. Prove the following: If p is prime, then φ(p1) = pi – pi-1. Hint: What numbers have a factor in common with pi? Path: p Words:0 10 points QUESTION 7 1. Six professors begin courses on Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday, respectively, and announce their intentions of lecturing at intervals of 2, 3, 4, 1, 6, and 5 days, respectively. The regulations of the university forbid Sunday lectures (so that a Sunday lecture must be omitted). When first will all six professors find themselves compelled to omit a lecture? Hint: Use the CRT.. QUESTION 1

  1. Reformulate Equation (2.1), removing the restriction that ais a nonnegative integer. That is, let a be any integer.
 

 

 
 

 

 

 

Path: p
Words:0

10 points   
QUESTION 2

  1. For each of the following equations, find an integer x that satisfies the equation.
  2. a) 5x 4 (mod 3)
  3. b) 7x 6 (mod 5)
  4. c) 9x 8 (mod 7)

30 points   
QUESTION 3

  1. Determine the GCD of the following;
  2. a) gcd(24140, 16762)
  3. b) gcd(4655, 12075)

20 points   
QUESTION 4

  1. Using Fermat’s theorem to find a number xbetween 0 and 28 with x85 congruent to 6 modulo 29. (You should not need to use any brute-force searching.)

10 points   
QUESTION 5

  1. Use Euler’s theorem to find a number abetween 0 and 9 such that a is congruent to 71000 modulo 10. (Note: This is the same as the last digit of the decimal expansion of 71000).

10 points   
QUESTION 6

  1. Prove the following:

If p is prime, then φ(p1) = pi – pi-1. Hint: What numbers have a factor in common with pi?

 

 

 
 

 

 

 

Path: p
Words:0

10 points   
QUESTION 7

  1. Six professors begin courses on Monday, Tuesday, Wednesday, Thursday, Friday,and Saturday, respectively, and announce their intentions of lecturing at intervals of 2, 3, 4, 1, 6, and 5 days, respectively. The regulations of the university forbid Sunday lectures (so that a Sunday lecture must be omitted). When first will all six professors find themselves compelled to omit a lecture? Hint: Use the CRT.

 

QUESTION 1 1. Reformulate Equation (2.1), removing the restriction that a is a nonnegative integer. That is, let a be any integer. Path: p Words:0 10 points QUESTION 2 1. For each of the following equations, find an integer x that satisfies the equation. a) 5x ≡ 4 (mod 3) b) 7x ≡ 6 (mod 5) c) 9x ≡ 8 (mod 7) 30 points QUESTION 3 1. Determine the GCD of the following; a) gcd(24140, 16762) b) gcd(4655, 12075) 20 points QUESTION 4 1. Using Fermat's theorem to find a number x between 0 and 28 with x85 congruent to 6 modulo 29. (You should not need to use any brute-force searching.) 10 points QUESTION 5 1. Use Euler's theorem to find a number a between 0 and 9 such that a is congruent to 71000 modulo 10. (Note: This is the same as the last digit of the decimal expansion of 71000). 10 points QUESTION 6 1. Prove the following: If p is prime, then φ(p1) = pi – pi-1. Hint: What numbers have a factor in common with pi? Path: p Words:0 10 points QUESTION 7 1. Six professors begin courses on Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday, respectively, and announce their intentions of lecturing at intervals of 2, 3, 4, 1, 6, and 5 days, respectively. The regulations of the university forbid Sunday lectures (so that a Sunday lecture must be omitted). When first will all six professors find themselves compelled to omit a lecture? Hint: Use the CRT.

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