सिद्ध कीजिए कि- \[ \frac{{ }^{n} P_{r}}{{ }^{n} P_{r-2}}=(n-r+1)(n-r+2) \]
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0सिद्ध कीजिए कि-
\[
\frac{{ }^{n} P_{r}}{{ }^{n} P_{r-2}}=(n-r+1)(n-r+2)
\]
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