Commonly, a binomial coefficient is indexed by a pair of integers n ≥ k ≥ 0 and is written as " - quoted from Wikipedia.
ໂດຍທົ່ວໄປ, ຕົວຄູນ binomial ແມ່ນຖືກດັດສະນີໂດຍຄູ່ຄູ່ n ≥ k ≥ 0 ແລະຖືກຂຽນເປັນ " - ອ້າງອີງຈາກ Wikipedia