Permutations and Combinations - Class XI

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Multiple Choice

From 0 to 9 , four digited numbers can be formed such that
the digits  are in ascending order is

  1. ${}^{10}{P _4}$
  2. ${}^{10}{C _4}$
  3. ${}^{10}{P _4} - {}^9{P _3}$
  4. ${}^{10}{C _4} - {}^9{C _3}$
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