1. Tardigrade
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  3. Mathematics
  4. There are 7 different books each having 10 copies. The number of ways in which a selection can be made from them is :

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Q. There are 7 different books each having 10 copies. The number of ways in which a selection can be made from them is :

Permutations and Combinations

Solution:

Correct answer is (c) $11^7-1$