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(i) यदि ""^(5)P(r) = ""^(6)P(r-1) है तो ...

(i) यदि `""^(5)P_(r) = ""^(6)P_(r-1)` है तो का मान ज्ञात कीजिए ।
(ii) `""^(5)P_(r) = 2 xx ""^(6)P_(r-1)` है तो r का मान ज्ञात कीजिए ।

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