The number of ways of choosing 10 obects out of 31 obects of which 10 are identical and the remaining 21 are distinct is:

Question:

The number of ways of choosing 10 objects out of 31 objects of which 10 are identical and the remaining 21 are distinct is:

  1. $2^{20}-1$

  2. $2^{21}$

  3. $2^{20}$

  4. $2^{20}+1$

Correct Option: 3

JEE Main Previous Year 1 Question of JEE Main from Mathematics Permutations And Combinations chapter.
JEE Main Previous Year April 12, 2019 (I)

Solution:

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