\( { }^{12} P_{r}={ }^{11} P_{6}+6 .{ }^{11} P_{5} \) then \( r \) (A) 6 (B) 5 (C) 7 (D) none of...

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\( { }^{12} P_{r}={ }^{11} P_{6}+6 .{ }^{11} P_{5} \) then \( r \)
(A) 6
(B) 5
(C) 7
(D) none of these
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