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`.^(n)P_(r)` का मान होगाA. `.^(n-1)P_(r)+r.^(n-1)P_(r-1)`B. `(n!)/(r!(n-r)!)`C. `r.^(n-1)P_(r)-.^(n-1)P_(r-1)`D. `.^(n-1)P_(r)+.^(n-1)P_(r-1)`

Answer» Correct Answer - C


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