Question: Im learning to use these formulas by following indicators like distinctness, repetition or no repetition, and order (rank), is there an EASIER way to know

Im learning to use these formulas by following indicators like distinctness, repetition or no repetition, and order (rank), is there an EASIER way to know if it is nPr or nCr, any kind of cheat codes, I assumed nPr for this problem as I figured the different classes meant that we were following ranks.

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=+for the shareholder of the acquiring company?

=+for the shareholder of the acquired company?

=+for the acquired company?