A photographer will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row. The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her. How many such arrangements of the 6 people are possible?
Well, this has been discussed before, however people just give some examples , can someone explain any formular to solve this problem in an easy way???
like 3P3, or 3C3 to calculate ways to arrange people.
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