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The end points of a diameter of circle are $(2, 4)$ and $(-3, -1)$. The length of its radius is:
- (a)$\frac{5\sqrt{2}}{2}$ units
- (b)$5\sqrt{2}$ units
- (c)$3\sqrt{2}$ units
- (d)$\pm \frac{5\sqrt{2}}{2}$ units
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(A) $\frac{5\sqrt{2}}{2}$ units