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Old Thursday, June 23, 2011
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Quote:
Originally Posted by sairaasif11 View Post
Well when 10 people have shaken hands, it means every one person has shaken hand with 9 other people...so it should be 90.
45 is the right answer..

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Originally Posted by Warda Riaz View Post
Plz elaborate your answer
let see if 10 people ...then

1st person = 9 handshake
2nd person = 8 handshake (coz handshake with 1st person already counted)
3rd person= 7 handshake ( coz handshake with 1st and 2nd person already counted above)

and so on ....
it is sumthing like : 9+8+7+6+5+4+3+2+1 =45 :P
but for large number u cant do this ..
so just remember this formula for this type of question
n*n-1 = r then r/2= Answer

now apply on above question

10*9=90 then 90/2 = 45
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Last edited by Chauhdary12; Friday, June 24, 2011 at 02:42 AM. Reason: Merged
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  #22  
Old Thursday, June 23, 2011
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Originally Posted by Warda Riaz View Post
Plz elaborate your answer
10*9=90 90/2= 45

10 people will shake hand with 9 people in 90 times but with repetition (aslam shakes hand with aslam and aslam shakes hand with akram) thats why we devided 90 by 2 so we get 45
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