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Grade 9Algebra

The Twenty20 World Cup Finals has just ended with India defeating Australia. Each of the 11 Aussie players shakes hand with every indian player. How many shake hands were there after the match?

(a)55 (The Given Anser)

(b)121 (Answer That I Got)

(c)66

This was the question asked in IIT Maths olympiad last year in the 1st level. I am in 9th standard.Please Give The Answer with solution.

Profile image of Ritwick D'souza
15 Years agoGrade 9
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2 Answers

Profile image of Amit Tapas
ApprovedApproved Tutor Answer15 Years ago

Use the formula n(n-1)/2

n=11

so 11*10/2

  =11*5

=55

Profile image of smita shah
15 Years ago

I want to understand the logic  for ans 55 as n(n-1)/2  is  describing it properly.Can any body help?