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Total Possible 3 digit number that can be formed is 900 (since we can’t place 0 in front so 9 * 10 * 10).

now given condition that 2 is in right of 1 can be satisfied if number are placed in (**x 2 1)** or (**2 1 x**) order. so since **9** numbers can be placed in former order and **10** in later. so answer = 900 – 10 – 9 = 881. **Option C** is correct.