The number of values of ' \( r \) ' satisfying the equation \( { }^{39} C_{3 r-1}-{ }^{39} C_{r^...

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The number of values of ' \( r \) ' satisfying the equation \( { }^{39} C_{3 r-1}-{ }^{39} C_{r^{2}}={ }^{39} C_{r^{2}-1}-{ }^{39} C_{3 r} \) is
(a) 1
(b) 2
(c) 3
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