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[" 7.यदि "56(p+6):54P(r+3)=30800:1" तो "...

[" 7.यदि "56_(p+6):54P_(r+3)=30800:1" तो "r" का मान ज्ञात कीजिए। "],[" 8.यदि "nP_(6)=30times^(n)P_(4)" ,तो "n" का मान ज्ञात कीजिए। "],[" उदाहरण 7.अंक "1,2,3,4,5,6,7,8,9" से कितनी संख्याएँ नों "]

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