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Grade: 11
        

there are 8 railway stations along a rail line.in how many way can a train be stopped at 3 of these stations such that no two of them are consecutive?

8 years ago

Answers : (3)

SAGAR SINGH - IIT DELHI
879 Points
							

Dear student,

The required number of ways=8P3

Use permutation

8 years ago
Srividya Reddy
26 Points
							No.of ways to select 3 stations among 8 stations = 8C3No.of possibilities of 3stations might be consecutive = 6No.Of possibilities of 2 stations among those 3 might be consecutive = 30So, resultant answer is 8C3 - 6 - 30 = 20
						
2 years ago
K R G Deepak Teja
19 Points
							
Total No of way can a train be stopped= 8c3=42
let those eight stations be {1 2 3 4 5 6 7 8}
{(1,2)(2,3)(3,4)(4,5)(5,6)(6,7)(7,8)}7 {(1,2,3)(2,3,4)(3,4,5)(4,5,6)(5,6,7)(6,7,8)}No.Of waysof 2 stations among those 3 might be consecutive =6No.of ways of 3stations might be consecutive = 
therefore Ans is 42-(6+7)=20 
one year ago
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