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there are some match sticks 1,3,5,7,9,11,13 cms.what is the probability of getting a triangle...

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3) In a race of 4000m around a circular ground of circum 1000m The fastest and slowest athletes meets first time 5 min after the starting of race . the speed of the all athletes remains constants over the race . The speed of the fatest is double of the slowest athletes. Than in how much time the athletes who wins the race will complete the race.......
solve these equations
x+y=13
40/x+40/y=13