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n-সংখ্যক বিভিন্ন বস্তু থেকে একযোগে r সংখ্যক বস্তুর বিন্যাস সংখ্যা কত হবে, যখন 4-এটি বিশেষ বস্তু কখনোই থাকবে না?

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n-সংখ্যক বিভিন্ন বস্তু থেকে একযোগে r সংখ্যক বস্তুর বিন্যাস সংখ্যা কত হবে, যখন 4-এটি বিশেষ বস্তু কখনোই থাকবে না?
A. `.^nP_(r-4)`
B. `.^(n-4)P_(r-4)`
C. `.^(n-4)Pr`
D. `.^nP_r-4`
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Correct Answer - C
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