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Using all the letters of the word "NOKIA", how many words can be formed, which begin with N and end with A?

  • A.3
  • B.6
  • C.24
  • D.120

Answer: B

The first and last letters are fixed as N and A, leaving O, K and I for the three middle positions.

\[ 3! = 6 \]

Without the restriction all five letters could move, giving \( 5! = 120 \).

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