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Puzzle for a child


harrycatcat1
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1 hour ago, marsh man said:

Tell yer what Harry , how on earth can a ten year old work that one out , I have read it half a dozen times and still no wiser , maybe living in Norfolk we didn't do a lot of hand shaking when we were ten year old :lol:

To be honest I couldn't make head nor tail of it, how the kids do it I don't know 🤔🤔🤔🤔

1 hour ago, Ricko said:

It's an old one, the sequence follows the Triangle numbers; 1, 3, 6, 10, 15, 21, 28...

If n is the number of people, then the number of handshakes is given by:

(n(n-1))/2

😣😣😣😣😣😣🤔🤔🤔🤔🤔

Call me thick but could you please let me know how this works. Genuinely interested 👍

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1 hour ago, harrycatcat1 said:
7 minutes ago, Yellow Bear said:

n is 7 Number of people therefore 7X6 (n-1) divided by 2 gives 42 div 2  =  21

😣😣😣😣😣😣🤔🤔🤔🤔🤔

Call me thick but could you please let me know how this works. Genuinely interested 👍

There you go Harry , Yellow Bear have simplified it for the likes of us two , our old teacher used to write on my report , must try harder and room for improvement , that is putting it mildly in case of any ten year old children are reading this :lol:

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20 minutes ago, marsh man said:

There you go Harry , Yellow Bear have simplified it for the likes of us two , our old teacher used to write on my report , must try harder and room for improvement , that is putting it mildly in case of any ten year old children are reading this :lol:

Phew, I don't know how I didn't think of that 🤣🤣🤣🤣🤣🤣

36 minutes ago, Yellow Bear said:

n is 7 Number of people therefore 7X6 (n-1) divided by 2 gives 42 div 2  =  21

Thanks again 👍👍👍👍

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19 hours ago, spurs 14 said:

Blimey that last one made it looked complicated ! I’m for an easy life as was drummed into us K,I,S,S ,         Keep it simple , stupid      Call me old fashioned but pencil an£ paper normally works it out 

  That's OK if you have 5, 10 or maybe 15 people; now do it for 134 people !

The whole point of Algebra is scale/repetition

RS

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