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In [1]:

    
from scipy.special import comb



In [2]:

    
print(comb(4, 2))

6.0



In [3]:

    
print(comb(4, 2, exact=True))



In [4]:

    
print(comb(4, 0, exact=True))



In [5]:

    
print(comb(4, 2, exact=True, repetition=True))