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1 . Consider a group consisting of 7 girls and 6 boys. Elisa is one of the girls. How many ways are there to arrange these 13 people on a horizontal line such that Elisa has 2 neighbors, both of whom are girls? (The order on the line matters.)
(a)
12
⋅
6
⋅
5
⋅
10
!
(b)
11
⋅
6
⋅
5
⋅
10
!
(c)
13
⋅
6
⋅
5
⋅
10
!
(d)
11
⋅
(
6
2
)
⋅
10
!
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