Oh, dude, let me break it down for you. So, out of the 100 numbers from 0 to 99, there are 20 numbers that contain the digit 7 (7, 17, 27... you get it). So, the fraction would be 20/100, which simplifies to 1/5. Easy peasy, lemon squeezy!
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Fraction: 99/100 Decimal: 0.99
495/99 = 5 which is a whole number, not a proper fraction.
99%99% = 99/10099/100 = 0.9999/100 is the fraction.0.99 is the decimal.
1.101010... = 1 10/99 (as a mixed number) = 109/99 (as an improper fraction)
99/100 = 0.99