MCQ
${ }^n P_r$ નું સૂત્ર જણાવો.
- ✓${ }^n P_r={ }^n C_r \times r$ !
- B${ }^n P_r=\frac{{ }^{ n } C_r}{ r !}$
- C${ }^n P_r=\frac{( n - r )!}{ n !}$
- D${ }^n P_r=n(n-1)(n-2) \ldots .(n+r-1)$
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