Find the step size between known numbers.<br><br>
&bull; 805 to 1805 = +1000<br>
&bull; 1805 to 2805 = +1000<br>
&bull; So the pattern increases by 1000 each step.<br>
&bull; 2805 + 1000 = 3805<br>
&bull; 3805 + 1000 = 4805<br>
&bull; 4805 + 1000 = 5805<br><br>
Final Answer: A = 3805, B = 4805, C = 5805