सिद्ध कीजिए कि- \[ { }^{9} P_{4}+4 \cdot{ }^{9} P_{3}={ }^{10} P_{4} \]
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सिद्ध कीजिए कि-
\[
{ }^{9} P_{4}+4 \cdot{ }^{9} P_{3}={ }^{10} P_{4}
\]
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