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The results of 21 football matches (win,...

The results of 21 football matches (win, lose or draw) are to the predicted. The number of forecasts that contains exactly 18 correct results is (i) `.^21C_3(2^18)^` (ii) `.^21C_3(2^3)` (iii) `(3^21)-2^18` (iv) `.^21C3(3^21)-2^18`

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