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If ""^(12)C(r+1)=""^(12)C(3r-5), find r....

If `""^(12)C_(r+1)=""^(12)C_(3r-5),` find r.

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I : IF ""^(12)C_(r+1) ="" ^(12) C_(3r-5) then r=3 or 4 . II : If ""^(9) C_(3) +""^(9)C_(5) = ""^(10)C_(r) then r=4 or 6.

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