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(i) .^(18)P(r)=4896 तो r का माप ज्ञात की...

(i) `.^(18)P_(r)=4896` तो `r` का माप ज्ञात कीजिए।
(ii) `.^(9)P_(4)=60480` तो `r` का मान बताओ।

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