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let x=a*b*c
if a+b+c=8 then
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print s;a;b;c
end if
next c
next b
next a
END
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public class Question494 {
¡¡public static void main(String[] args) {
¡¡¡¡int s = 0;
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¡¡¡¡¡¡for (int y = 1; y < 8-x; ++y) {
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V = ­ô[i=1,n-2]{­ô[j=1,n-1-i]{i * j * (n-i-j)}}
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­ô[i=1,n]{i} = 1/2 * n(n+1)
­ô[i=1,n]{i^2} = 1/6 * n(n+1)(2n+1)
­ô[i=1,n]{i^3} = 1/4 * n^2 * (n+1)^2
­ô[i=1,n]{i^4} = 1/30 * n(n+1)(2n+1)(3n^2 + 3n - 1)
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V = ­ô[i=1,n-2]{­ô[j=1,n-1-i]{i * j * (n-i-j)}}
= ­ô[i=1,n-2]{­ô[j=1,n-1-i]{i * ((n-i) * j - j^2)}}
= ­ô[i=1,n-2]{i * ((n-i) * 1/2 * (n-1-i)(n-i) - 1/6 * (n-1-i)(n-i)(2n-2i-1))}
= ...
= 1/6 * ­ô[i=1,n-2]{i(n-i)^3 - i(n-i)}
= 1/6 * ­ô[i=1,n-2]{- i^4 + 3n * i^3 - (3n^2 - 1) * i^2 + (n^3 - n) * i}
= 1/6 * {- 1/30 * (n-2)(n-1)(2n-3)(3(n-2)^2 + 3(n-2) - 1) + 3n * 1/4 * (n-2)^2 * (n-1)^2
- (3n^2 - 1) * 1/6 * (n-2)(n-1)(2n-3) + n(n-1)(n+1) * 1/2 * (n-2)(n-1)}
= ...
= 1/360 * (n-2)(n-1) * (3n^3 + 9n^2 + 6n)
= 1/120 * (n-2)(n-1)n * (n^2 + 3n + 2)
= 1/120 * (n+2)(n+1)n(n-1)(n-2)
= (n+2)(n+1)n(n-1)(n-2)/5!
= (n+2)C5
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