How long would this take to solve or randomly guessing ?
This question should be must able to guess
Eight baseballs in Jack's bag, including two red signed balls, are randomly drawn, and placed in the figure. What is the probability that 2 signed balls will be adjacent to each other?
(7!×2!)/8!=1/4
Counting from 8! permutations, if the ball is replaced by 2 hidden red signed balls, there are 7! of these arrangements. Within the blocks of two ball ls, there are 2! arrangements.
The math looks good, but the language is sure funky ...
"This question should be must able to guess" ??? what does that even mean?
"if the ball is replaced ..." which "the ball" ??