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" If "^(8)C(r)-^(7)C(3)=^(7)C(2)" then "...

" If "^(8)C_(r)-^(7)C_(3)=^(7)C_(2)" then "r=

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If ^(8)C_(r)-^(7)C_(3)^(7)C_(2)f in dr

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.^(n) C_(2) + .^(7)C_(3) = .^(8) C_(3)

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