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" If "12P(r)=1320" then,ris equal to: "...

" If "12P_(r)=1320" then,ris equal to: "

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If "^12P_r = 1320, then r is equal to

If ""^(12)P_r=1320 find r

If ""^(12)P_(r)=1320 , find r.

If ""^(n)P_(r) = 840 and ""^(n)C_(r) = 35 , then r is equal to ………… .

If ""^(n)P_(r) = 840 and ""^(n)C_(r) = 35 , then r is equal to ………… .

If 12p_(r)=1320, then prove that r=3

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