Find the step size and work backwards from the known numbers.<br><br>
&bull; 3254 to 3354 = +100<br>
&bull; 3354 to 3454 = +100<br>
&bull; So the pattern increases by 100 each step.<br>
&bull; Working backwards: 3254 &minus; 100 = 3154<br>
&bull; 3154 &minus; 100 = 3054<br>
&bull; 3054 &minus; 100 = 2954<br>
&bull; Check: 2954, 3054, 3154, 3254, 3354, 3454 &check;<br><br>
Final Answer: A = 2954, B = 3054, C = 3154