Welcome, Guest: Register On Nairaland / LOGIN! / Trending / Recent / NewStats: 3,191,944 members, 7,946,088 topics. Date: Wednesday, 11 September 2024 at 12:23 PM |
Nairaland Forum / Nairaland / General / Education / Can I Get Answer To This ? (578 Views)
Do You Know You Can Get Answer To Square Root Of Surds Without Working? / What Was Your Craziest Answer To A Question In School? / Best Answer To This Question At ATM Point. "Are You The Last Person"? (2) (3) (4)
Can I Get Answer To This ? by caljulator(m): 10:33pm On Dec 15, 2016 |
Got this question in an interview recently that got me puzzled "If everybody at a party shook hand with each other and there are total of 66 handshakes, How many people attended the party ? Am sure there are gurus in the house |
Re: Can I Get Answer To This ? by Godwin0420(m): 12:24pm On Dec 16, 2016 |
12 people |
Re: Can I Get Answer To This ? by caljulator(m): 9:56pm On Dec 16, 2016 |
Godwin0420:please how come |
Re: Can I Get Answer To This ? by Nobody: 10:16pm On Dec 16, 2016 |
Godwin0420:correct, oga boss na you o |
Re: Can I Get Answer To This ? by Nobody: 10:37pm On Dec 16, 2016 |
caljulator:I really want godwin0420 to explain how he got the answer. I know for a fact that he is right, you can confirm by solving it backwards. I also solved it myself but it took me a whole lot of time and I don't know how to explain it well, I sha developed this method and i'm pretty sure it works for all cases though it is a bit cumbersome and lengthy 1+2+...+(x-1) = y, where x is the number of people in the party and y is the total number of handshakes. assuming the total number of people shaked each other just ones. so therefore we have, 1+2+3+4+5+6+7+8+9+10+11=66, from this you can infer that (x-1)=11, so therefore x = 12, it works for all cases, e.g if we had 6 hand shakes in all it means 1+2+3=6, so therefore (x-1)=3, then x =4, e.g2 if we had 10 handshakes in all it means 1+2+3+4=10, so therefore (x-1) = 4, then x = 5. I know there must be an easier way to this, oga godwin show us the way. This method above took me time to develop. 2 Likes 1 Share |
Re: Can I Get Answer To This ? by Nobody: 10:42pm On Dec 16, 2016 |
so just keep adding starting consecutively from 1till you get the total number of handshakes, keeping in mind that the last number is equal to x-1. or simply just add 1 to the last number. there definitely has to be an easier way, maybe through combination and permutation. 1 Like |
Re: Can I Get Answer To This ? by Godwin0420(m): 11:37am On Sep 08, 2017 |
The total number of handshakes= n(n-1)/2 where n is the number of people involved.
|
(1) (Reply)
This Babcock University Student Commits Suicide – 2017 / Funaab Aspirants 17/18 / Www.waeconline.org.ng | Waec Registration Form 2017/2018
(Go Up)
Sections: politics (1) business autos (1) jobs (1) career education (1) romance computers phones travel sports fashion health religion celebs tv-movies music-radio literature webmasters programming techmarket Links: (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) Nairaland - Copyright © 2005 - 2024 Oluwaseun Osewa. All rights reserved. See How To Advertise. 15 |