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The logic followed here is as follows: 5 is added to the square of the first number to get the second number. 17² + 5 = 289 + 5 = 294 Similarly, 5 is added to the square of the fifth number to get the sixth number. 21² + 5 = 441 + 5 = 446 So, Third number² + 5 = Fourth number Third number² = 905 – 5 Third number² = 900 Third number= 30
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