[問題] GWD-Math 1-25
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?
: 答案是5種, 可是我怎麼想都只有一組解阿..假設身高由低到高是1-6
: row one 123
: row two 456
題目給的條件 1 身高有左至右遞增 2.第2排的人要高於他前面的
我有哪裡沒有考慮到嗎?
謝
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