Using all the letters of the word "NOKIA", how many words can be formed, which begin with N and end with A?
Correct answer: B. 6
- A. 3
- B. 6
- C. 24
- D. 120
Explanation
Fix N in the first position and A in the last position. The remaining letters O, K and I can be arranged in the three middle positions in 3! = 3 x 2 x 1 = 6 ways. The likely trap is option c, 24, which counts arrangements without fixing the first and last letters.
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