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Sticky Note
1/10^9-1/10^10=?
  1. 9×10 (−10 )
  2. 10 (−9 )
  3. 9×10 (−11 )
  4. None of these
Explanation

1091​−10101​=101010​−10101

=10−11010=91010=9×10−11


= frac{10 - 1}{10^{10}} = frac{9}{10^{10}} = 9 times 10^{-11}

=101010−1​=10109​=9×10−11

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