Questions
If three squares are selected at random from chessboard, then the probability that they form the letter "L" is
detailed solution
Correct option is A
We have,n(S)=64C3Let 'E' be the event of selecting 3 squares which form the letter 'L' .The number of ways of selecting squares consisting of 4 unit squares is 7 x 7 = 49.Each square with 4 unit squares form 4 L-shapes consisting of 3 unit squares. Therefore,n(E)=7×7×4=196∴ P(E)=196 64C3Talk to our academic expert!
Similar Questions
A bag contains 10 different balls. Five balls are drawn simultaneously and then replaced and then seven balls are drawn. If the probability that exactly three balls are common to the two draws is p, then the value of 8p is ________.
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