Tamil Nadu Board of Secondary EducationHSC Commerce Class 11

Thirteen guests have participated in a dinner. The number of handshakes that happened in the dinner is: - Business Mathematics and Statistics

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MCQ

Thirteen guests have participated in a dinner. The number of handshakes that happened in the dinner is:

Options

  • 715

  • 78

  • 286

  • 13

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Solution

78

Explanation:

To handshakes, we need two guests.

Number of selecting 2 guests from 13 is 13C2 = `(13 xx 12)/(2 xx 1)` = 78

Concept: Combinations
  Is there an error in this question or solution?
Chapter 2: Algebra - Exercise 2.7 [Page 47]

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