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Find the value of the combination 

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ISRO URSC Technical Assistant Mechanical 13 Nov 2016 Official Paper
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  1. 459
  2. 455
  3. 495
  4. 485

Answer (Detailed Solution Below)

Option 3 : 495
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Detailed Solution

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Concept:

We have the factorial representation of  as, .

Calculation:

 = 

 = 

 = 

 = 495

Hence the value of  is 495.

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