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NEST2020MathematicsPermutation and Combination

Let n be a randomly chosen integer from the set 100,101, , 999 . The probability that the sum of the digits of n is equal to 24 is

Options

  1. A11 89
  2. B1 90
  3. C3 89
  4. D1 87

Correct answer

B. 1 90

Step-by-step solution

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