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21 lines
455 B
Python
21 lines
455 B
Python
def binomial_coefficient(n: int, r: int) -> int:
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"""
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Find binomial coefficient using pascals triangle.
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>>> binomial_coefficient(10, 5)
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252
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"""
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c = [0 for i in range(r + 1)]
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# nc0 = 1
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c[0] = 1
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for i in range(1, n + 1):
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# to compute current row from previous row.
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j = min(i, r)
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while j > 0:
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c[j] += c[j - 1]
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j -= 1
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return c[r]
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print(binomial_coefficient(n=10, r=5))
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