With a sharp tip of the pencil, mark four points on a paper and name them by the letters A, C, P, H. Try to name these points in different ways and how many different ways it can be named. One such way could be this.

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answer is B.

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Detailed Solution

Concept: Approach by securing every point to every position such that one letter is taken into account for each true. To avoid recurrence, we must determine all feasible naming strategies.
We can solve this question by using permutation.
Total number of outcomes

Here,

and

Hence, the correct answer is option 2

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