A photographer will arrange 6 people of 6 different heights for a photograph by placing them in two rows of three so

A photographer will arrange 6 people of 6 different heights for a 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 for the 6 people are possible?

(A) 5
(B) 6
(C) 9
(D) 24
(E) 36

Answer: A

Source: GMAT Prep

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