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30a2+89a+63 = (5a+9)(6a+7) when factored
1 + 62 = 63 or 62 + 1 = 63 or 62 +1 63 ===
62/63 is in its simplest form.
In reverse: 63 - 1 = 2n = 62 62 / 2 = 31 Now as the question: (2 x 31) + 1 = 62 + 1 = 63 Q.E.D.
Rounded to two decimal places, 62 / 63 x 100 = 98.41%