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Fill in the Blanks If $^nP_r = 840, ^nC_r = 35$ , then r = ______.

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$\\^n{P_{r}}=840 \text { and } ^n{C_{r}}=35 \\ ^n{P_{r}}=^n{C_{r}} * r ! \\ 840=35 * r ! \\ r !=24\: \: , r=4$

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