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What is the value of x if 

  1. 21
  2. 54
  3. 3
  4. 100

Answer (Detailed Solution Below)

Option 4 : 100
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Detailed Solution

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Concept:

Some useful formulas are:

n! = n.(n - 1).(n - 2)...3.2.1

Calculation:

Given expression is 

∴ 

∴ 

∴ 

∴ x = 100

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