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      Question

      How many 100 digit positive numbers are there?

      A 9 × 10^99 Correct Answer Incorrect Answer
      B 9 × 10^100 Correct Answer Incorrect Answer
      C 10100 Correct Answer Incorrect Answer
      D 11 × 10^98 Correct Answer Incorrect Answer

      Solution

      The given number has 100 digits first digit can be any number other than 0 and so it has 9 values from 1 to 9 All the other 99 digits can be from 0 to 9 i.e 10 values therefore 9*10*10....99 times =   9 × 10 99

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