Multiple choice Directions: Fill the blank with correct alternative. 121, 225, 361, (…..) 441 484 529 729 Reveal answer Fill a bubble to check yourself C Correct answer Explanation The numbers are 112, 152, 192, …., i.e. 112, (11 + 4 x 1)2, (11 + 4 x 2)2 ,…. So, missing number = (11 + 4 x 3)2 = (23)2 = 529.