40 Sharky a leader of the underworld was killed by one of hi

40. Sharky, a leader of the underworld, was killed by one of his own band of four henchmen. Detective Sharp interviewed the men and determined that all were lying except for one. He deduced who killed Sharky on the basis of the following Statements: a. Socko: Lefty killed Sharky. b. Fats: Muscles didn\'t kill Sharky. c. Lefty: Muscles was shooting craps with Socko when Sharky was knocked off d. Muscles: Lefty didn\'t kill Sharky. Who did kill Sharky?

Solution

only one of them is telling the truth

if (a) is true

=>

lefty killed sharky, => marky didnt kill sharky => b is also true => not possible

=>

(a) is false => lefty didnt kill sharky => d is true

=>

a,b, c are false, d is true

=>

Muscles killed sharky (since b is false)