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n(B) = 6
gunakan segitiga pascal
barisan ke-6 adalah 1 6 15 20 15 6 1
anggota 3 ada 20
{-1,0,1}, {-1,1,2}, {-1,2,3}, {-1,3,4}, {0,1,2}, {0,2,3}, {0,3,4}, {1,2,3} , {1,3,4}, {2,3,4}
{-1,0,2}, {-1,0,3}, {-1,0,4}, {0,1,3}, {0,1,4}, {1,2,4}, .....
lanjutkanlah