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Exercises 28-35 relate to inhabitants of an island on which there are three kinds of people: knights who always tell the truth, knaves who always lie, and spies (called normals by Smullyan [Sm78]) who can either lie or tell the truth. You encounter three people,A,B, andC. You know one of these people is a knight, one is a knave, and one is a spy. Each of the three people knows the type of person each of other two is. For each of these situations, if possible, determine whether there is a unique solution and determine who the knave, and spy are. When there is no unique solution, list all possible solutions or state that there are no solutions.
34. A says "l am not the spy,Bsays "I am not the spy, andCsays "Ais the spy."
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Chapter 1 Solutions
Discrete Mathematics and Its Applications ( 8th International Edition ) ISBN:9781260091991
- Three streams - Stream A, Stream B, and Stream C - flow into a lake. The flow rates of these streams are not yet known and thus to be found. The combined water inflow from the streams is 300 m³/h. The rate of Stream A is three times the combined rates of Stream B and Stream C. The rate of Stream B is 50 m³/h less than half of the difference between the rates of Stream A and Stream C. Find the flow rates of the three streams by setting up an equation system Ax = b and solving it for x. Provide the values of A and b. Assuming that you get to an upper-triangular matrix U using an elimination matrix E such that U = E A, provide also the components of E.arrow_forwardA 315-N force F and 70-N-m couple M are applied to co rner A of the block shown. Replace the given force -couple system with an equivalent force -couple systemat corner Darrow_forwardIn the figure below, m₁ || m² and ms ms. 42° m₁ A m3 m4 to What is the value of x? 'ms •m₂ ○ A. 42 ○ B. 48 ○ C. 138 ○ D. 158arrow_forward
- A force and couple are applied to a beam as shown below . (a) Replace this systemwith a single force F applied at point G, and determine the distance d. (b) Solve part aassuming that the directions of the two 600 -N forces are reversed Help finding the distancesarrow_forwardanswer the question in image.arrow_forwardx If f(x) = = L* f(t)dt then find the value of ƒ (ln 7). f: R R is continuous everywhere.arrow_forward
- An eccentric, compressive 270-lb force P is applied to the end of a cantilever beam. Replace P with an equivalent force-couple system at G.arrow_forward100 identical balls are rolling along a straight line. They all have speed equal to v, but some of them might move in opposite directions. When two of them collide they immediately switch their direction and keep the speed v. What is the maximum number of collisions that can happen? Let f(w) be a function of vector w Є RN, i.e. f(w) = 1+e Determine the first derivative and matrix of second derivatives off with respect to w. Let A Є RN*N be a symmetric, positive definite matrix and bЄ RN a vector. If x ER, evaluate the integral Z(A,b) = e¯xAx+bx dx as a function of A and b. John throws a fair die with faces labelled 1 to 6. ⚫ He gains 10 points if the die shows 1. ⚫ He gains 1 point if the die shows 2 or 4. • No points are allocated otherwise. Let X be the random variable describing John's gain at each throw. Determine the variance of X.arrow_forwardA 20 lb horizontal force P acts on a bell crank as shown below. (a) Replace P with an equivalent force-couple system at B. (b) Find the two vertical forces at C and D which are equivalent to the couple found in part aarrow_forward
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