Question 1193982
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(1) The back row must contain both boys and 2 of the 4 girls.  We need to choose 2 of the 4 girls to be in the back row.  The number of ways to do that is C(4,2) = 6.<br>
(2) We need to arrange the 4 people in the back row so that boys and girls alternate.
The first person in the row can be any of the 4
The second person must be one of the 2 of the opposite gender
The third person has to be the other student of the same gender as the first
The fourth person has to be the other student of the same gender as the second<br>
Number of ways to arrange the 4 people in the back row: 4*2*1*1 = 8<br>
(3) The two girls in the front row can be arranged in 2 different ways.<br>
Total number of ways to arrange the students in the photograph: 6*8*2 = 96<br>
ANSWER: 96<br>