Let A (3, 0) and B (6, 0) be two points on the x axis. Let P be (3, 5). Draw perpendicular to x axis passing through B and a perpendicular to y axis passing through P. Let Q be a point obtained by intersecting these perpendiculars. Let R be the point (3, 9). Find QR.
1
5
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3
3
1
4
2