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Find R If 5p_R = 2^6 P_(R-1) Permutations,

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प्रश्न

Find r if `""^5P_r = 2^6 P_(r-1)`

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उत्तर

∴0 ≤ r ≤ 5

Hence, r ≠ 10

∴r = 3

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