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  • World Geography and General Knowledge Quiz
  • (1/10)18 - (1/10)20 = ?
Multiple choice general knowledge

(1/10)18 - (1/10)20 = ?

  1. 99/1020

  2. 99/10

  3. 0.9

  4. None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Factor out (1/10)^18: (1/10)^18(1 - (1/10)^2) = (1/10)^18(1 - 1/100) = (1/10)^18(99/100) = 99/(10^18 * 10^2) = 99/10^20. This uses exponent rules and factoring.

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