the question is a permutation question
the formular for permutation is
nPr = n!/(n-r)!
in this case,
n = 25
r = 4
so,
nPr = 25!/(25 - 4)!
nPr = 25!/21!
nPr = 25 x 24 x 23 x 22 x 21!/21!
nPr = 303600
therefore,
its 303600 ways
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