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[" 13."^(n)C(r)+^(n)C(r-1)" equals "],[[...

[" 13."^(n)C_(r)+^(n)C_(r-1)" equals "],[[" (A) "^(n)C_(r+1)," (B) "^(n+1)C_(r)," (C) "^(n+1)C_(r-1),(D)^(n+1)C_(r+1)]]

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