Step-by-step explanation:
if Q is in the middle and ten children are on his right then there will be ten children on your left as well
therefore total children = 10 + 10 + 1 ( 1 is for Q and 10 for the children on the left and right)
now P is on the 15th from the left
therefore 14 children are on the right
and form this we can say that P is four on the right of Q
so there are 3 person in between them
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