Question

In: Advanced Math

One of the statements below is true, and the other is false. Identify which is which, give a direct proof of the true one, and give a counterexample to the false one.

One of the statements below is true, and the other is false. Identify which is which, give a direct proof of the true one, and give a counterexample to the false one.

(a) The sum of every four consecutive integers is a multiple of 4;

(b) the sum of every five consecutive integers is a multiple of 5.

(An arbitrary set of four consecutive integers can be written as n, n + 1, n + 2, and n + 3 for some n ∈ Z.)


Solutions

Expert Solution


Related Solutions

Determine whether the following statements are true or false, and give an explanation or a counterexample....
Determine whether the following statements are true or false, and give an explanation or a counterexample. (a) log3y< log2y for y> 1 (b) The domain of f(x) = ln(x^2) is x > 0
For each proposition, either give a counterexample showing it is false, or write a proof. (a)...
For each proposition, either give a counterexample showing it is false, or write a proof. (a) For all a, b, c ∈ Z, if ab divides c then a divides c and b divides c. (b) For all a, b, c ∈ Z, if a divides bc, then a divides b or a divides c.
True or False (proof or counterexample): If a strategy profile survives IESDS then it must also...
True or False (proof or counterexample): If a strategy profile survives IESDS then it must also be a Nash equilibrium.
True or False (proof or counterexample): In any Nash equilibrium, a player is always indifferent between...
True or False (proof or counterexample): In any Nash equilibrium, a player is always indifferent between playing any of her pure strategies.
Determine whether each statement is true or false. If false, give a counterexample. a. Interchanging 2...
Determine whether each statement is true or false. If false, give a counterexample. a. Interchanging 2 rows of a given matrix changes the sign of its determinant. b. If A is a square matrix, then the cofactor Cij of the entry aij is the determinant of the matrix obtained by deleting the ith row and jth column of A. c. Every nonsingular matrix can be written as the product of elementary matrices. d. If A is invertible, the AX =...
Identify which of the following statements is true and which is false. 1) _________   For a...
Identify which of the following statements is true and which is false. 1) _________   For a set of numerical data, if the mean is larger than the median, this is evidence of right-skew. 2) _________   Negative values of the standard deviation indicate that the set of values is even less dispersed than would be expected by chance alone. 3) _________   For a set of numerical data, if the mean and the median are of equal value, this is evidence of...
True or False. If true, quote a relevant theorem or reason, or give a proof. If...
True or False. If true, quote a relevant theorem or reason, or give a proof. If false, give a counterexample or other justification. The set of irrationals in the interval (0, 1) is not countable. (Assume the fact that the set of points in the interval (0, 1) is uncountable.)
True or False. If true, quote a relevant theorem or reason, or give a proof. If...
True or False. If true, quote a relevant theorem or reason, or give a proof. If false, give a counterexample or other justification. There is a one-to-one and onto map between the open interval (0, 1) and the open interval (4, 8).
Determine whether each of the following statements is True or False. If True, write a proof....
Determine whether each of the following statements is True or False. If True, write a proof. If False, exhibit a counterexample. 1) If m, n are arbitrary positive integers, then any system of form x ≡ a (mod m) x ≡ b (mod n) has a solution. 2) If m, n are arbitrary positive integers and the system x ≡ a (mod m) x ≡ b (mod n)     has a solution, then the solution is unique modulo mn. Modern Abstract...
Determine whether each of the following statements is True or False. If True, write a proof....
Determine whether each of the following statements is True or False. If True, write a proof. If False, exhibit a counterexample. 1) If m, n are arbitrary positive integers, then any system of form x ≡ a (mod m) x ≡ b (mod n) has a solution. 2) If m, n are arbitrary positive integers and the system x ≡ a (mod m) x ≡ b (mod n) has a solution, then the solution is unique modulo mn. Modern Abstract...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT