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At a party, everyone shook hands with everybody else. There
were 66 handshakes. How many people were at the party?
10
11
12
13
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Answer / chintan
Ans. 12
for 2 ppl thr is 1 hand shake
for 3 thr is 3(1+2)
for 4 thr is 6(1+2+3)
hence
12 ppl coz..sum of 1st 11 is 66...
| Is This Answer Correct ? | 62 Yes | 9 No |
Answer / geeyemaar
consider n be the no of people in the party,let us give the combination for those handshakes.for that,
nc2 = 66
n(n-1)/2 = 66
n(n-1) = 132
sq(n)-n = 132
sq(n)-n-132 = 0
sq(n)-12n+11n-132 = 0
(n-12)(n+11) = 0
n = 12,-11,
taking the positive value we get the answer as 12 Handshakes
| Is This Answer Correct ? | 36 Yes | 5 No |
Answer / breeze-dhanasekaran
ans is 12 persons
1'st person handshaken with 11 persons
2'nd person handshaken with 10 persons.....
same
11+10+9+8+7+6+5+4+3+2+1=66hand shacken
| Is This Answer Correct ? | 9 Yes | 1 No |
Answer / loday
its a logic question...n 12 is definatly nt an answer and its not a question where u use formula...if there are 12 ppl
12th person will have 11th shakes
since the 11th person has already shaken hand whit 12th he has
already 1 shake on him...and when he shakes hand with other he will have 10 shakes and the total bcme 11 shakes...and since its a question is bout handshake...when 2 ppl shake hand both the ppl gets 1 handshake each..and plz keep in mind that its handshakes...u cant have only 1ppl getting handshake points during handshake or wise that is not a handshake...handshake is something that both ppl shake hand...12 ppl shaking hand with each other's is 132 shakes...i have seen ppl disagree but get 12 ppl and see fr urself
| Is This Answer Correct ? | 4 Yes | 2 No |
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