nick1816 wrote:
There is a 7 × 7 chessboard. Two squares are chosen at random. What is the probability that the 2 squares have a common edge?
A. 1/14
B. 1/7
C. 2/7
D. 1/3
E. 1/2
Total number of squares 7*7=49. Select any 2 from 49: 49C2=1176.
The number of squares with a common edge = 7 (7 squares on each edge). Select any 2 from 7: 7C2=21.
We have a total of 4 edges therefore 21*4=84.
84/1176=1/14. Option (A) is correct.
Statistics : Posted by samarpan.g28 • on 04 Jun 2019, 02:04 • Replies 7 • Views 6543
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