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NDA2014MathematicsPermutation and CombinationActual

What is the number of ways in which one can post 5 letters in 7 letter boxes?

Options

  1. A7^5
  2. B3^5
  3. C5^7
  4. D2520

Correct answer

A. 7^5

Step-by-step solution

The correct answer is option(A)

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