we know that
A combination is the choice of r things from a set of n things without replacement and where order does not matter.and
A permutation is the choice of r things from a set of n things without replacement and where the order matters.
we are given that
The number of two-person selections from the four math is
4C2 = 4C2 = (4-2)!2! = 6.
Each of these pairs could be associated with one
of the three physicists, so 6x3=18 committees could be formed.
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