Answer :
We know that the diagonals of a parallelogram bisect each other
So the coordinates of the mid – point of the PR = Coordinates of the mid – point of the QS
{(2 + a)/2,(15 – 11)/2} = {(5 + 1)/2,(b + 1)/2}
2 + a = 6
a = 4
15 – 11 = b + 1
4 = b + 1
b = 3
Hence, a = 4, b = 3
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