Maths-
General
Easy

Question

A person wishes to make up as many different parties of 10 as he can out of 20 friends, each party consisting of the same number In how many of the parties the same man is found ?

  1. 380
  2. 19
  3. 90378
  4. 92378

The correct answer is: 92378


    20 minus 1 C subscript 10 minus 1 end subscript

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