Answer: 3/7
So the total number of children in a toboggan = 7 (5 boys + 2 girls)
The possible arrangement could be (7, 2) = 21 ways
Boys can be seated in between the girls in (3, 1) = 3 ways
And 4 boys can be seated in between the girls in 3 ways which would leave 2 places for the left behind boy
Probability = (6+3)
= 9 / 21
= 3/7