On a railway route there are 15 stations- The number of different kinds of - nd class tickets requiton in order that it may be possible to book a passenger from one station to another is

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On a railway ...

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On a railway route there are 15 stations. The number of different kinds of $Π^{n d}$ class tickets requiton in order that it may be possible to book a passenger from one station to another is

105

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210

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15!

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15!/2!

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Solution

The correct option is A 105
possible ways to book a passenger from one station to another is
Taking 2 at a time
$^{15} C_{2} = 105$

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On a railway route there are 15 stations. The number of different kinds of Πnd class tickets requiton in order that it may be possible to book a passenger from one station to another is

The correct option is A 105possible ways to book a passenger from one station to another isTaking 2 at a time15C2=105

On a railway route there are 15 stations. The number of different kinds of $Π^{n d}$ class tickets requiton in order that it may be possible to book a passenger from one station to another is

The correct option is A 105
possible ways to book a passenger from one station to another is
Taking 2 at a time
$^{15} C_{2} = 105$