Find the common difference. From 2250 to 2850 is 600 over 3 steps.<br><br>&bull; Common difference = 600 ÷ 3 = 200<br>&bull; First blank: 2250 + 200 = 2450<br>&bull; Second blank: 2450 + 200 = 2650<br>&bull; Check: 2650 + 200 = 2850 ✓<br>&bull; Third blank: 3050 + 200 = 3250<br><br>Final Answer: 2450, 2650, 3250