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Question
Find x if nPr = x nCr
Sum
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Solution
nPr = x nCr
We know that nCr = `(""^"n""P"_"r")/("r"!)`
∴ nPr = `x xx (""^"n""P"_"r")/("r"!)`
∴ 1 = `x/("r"!)`
∴ x = r!
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