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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.

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.

Grade:9

2 Answers

Amit Tapas
18 Points
10 years ago

Use the formula n(n-1)/2

n=11

so 11*10/2

  =11*5

=55

smita shah
16 Points
10 years ago

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

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