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" (ii) "If^(16)C(r)=^(16)C(r+2)," find "...

" (ii) "If^(16)C_(r)=^(16)C_(r+2)," find "^(r)C_(4)

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If ^(16)C_(r)=^(16)C_(r+2),f in d^(r)C_(4)

(i) If .^(20)C_(r)=.^(20)C_(r+6) , find r. (ii) If .^(18)C_(r)=.^(18)C_(r+2) , find .^(r)C_(5) .

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If .^(15)C_(3r)=.^(15)C_(r+3), find .^(r)C_(2) .

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If .^(15)C_(3r)=.^(15)C_(r+3), find .^(r)C_(2) .

If .^(13)C_(r)=^(13)C_(r+5) , find r.

If .^(22)C_(r+4)=^(22)C_(r+2) , find r.