If \( { }^{15} C_{3 r}={ }^{15} C_{r+3} \) then \( r \) is equal to....
If \( { }^{15} C_{3 r}={ }^{15} C_{r+3} \) then \( r \) is equal to
\( \mathrm{P} \)
(1) 5
(2) 4
(3) 3
(4) 2
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