The logic followed here is as follows: 5 is added to the square of the first number to get the second number. 15² + 5 = 225 + 5 = 230 Similarly, 5 is added to the square of the fifth number to get the sixth number. 23² + 5 = 529 + 5 = 534 So, Third number² + 5 = Fourth number Third number² = 789 – 5 Third number² = 784 Third number= 28
