3 In how many ways can we put 20 identical silver coins into five coloured boxes so that at most 3 coins go into the blue box at

Question

3 In how many ways can we put 20 identical silver coins into five coloured boxes so that at most 3 coins go into the blue box at least 4 into red and at most 5 into green The remaining boxes are yellow and black and may contain any number of coins Every box except the red one may also remain empty

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