If a person hits a target for m times and B for N times, the average number of rings is () A. a+bm+nB. 12(am+bn)C. am+bnm+nD. 12（am+bm）

The total number of rings in this person is (am + BN), and the total number of hits is (M + n), so the average number of rings in each hit is am + BNM + n

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