Selecting-a-random-star-is-a-1-15-chance-at-random-Lets-say-you-have-to-pick-a-second-random-star-that-is-next-to-it-Either-above-below-or-to-the-si

Question Number 4753 by FilupSmith last updated on 05/Mar/16

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Selecting a random star is a \frac{1}{15} chance

at random . Lets say you have to pick

a second random star that is next to it .

E i t h e r a b o v e, b e l o w, o r t o t h e s i d e .

What this the probability of selecting

the two stars correctly ?

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As far as i have worked out, if the first

star is not an edge or corner, the second

has a \frac{1}{4} chance

if the first is an edge, the second had a

\frac{1}{3} chance

if the first is a corner, the second is a \frac{1}{2}

chance .

what is the overall probability ? ? ?

Commented by prakash jain last updated on 05/Mar/16

If the first star is not an edge or corner then

you have 4 possibilities out of 14 remaining

how did you come with \frac{1}{4} ?

Commented by FilupSmith last updated on 05/Mar/16

Oh, s o r r y i meant there is a \frac{1}{4} chance ti

get the second in relation to the first