The centre of a circle is \( C(2, k) \). If \( A(2,1) \) and \( B(5,2) \) are two points on its ...

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The centre of a circle is \( C(2, k) \). If \( A(2,1) \) and \( B(5,2) \) are two points on its circumference, then the value of \( k \) is
(a) 6
(b) 2
(c) \( -6 \)
(d) \( -2 \)
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