A Quick brain teaser...

[Silly Sausage]

Without googling...

Prove 2 = 1

If a = b

multiply with a

a[SUP]2[/SUP] = ab

subtract b[SUP]2[/SUP]

a[SUP]2[/SUP] - b[SUP]2[/SUP] = ab - b[SUP]2[/SUP]

factor both sides...

(a + b)(a - b) = b(a - b)

divide out (a -b)

(a + b) = b

as a = b
a+a=a
2a=a
therefore
2=1

Spot the fatal flaw.

 

[Richard Burns]

Without googling...

Prove 2 = 1

If a = b

multiply with a

a[SUP]2[/SUP] = ab

subtract b[SUP]2[/SUP]

a[SUP]2[/SUP] - b[SUP]2[/SUP] = ab - b[SUP]2[/SUP]

factor both sides...

(a + b)(a - b) = b(a - b)

divide out (a -b)

(a + b) = b

as a = b
a+a=a
2a=a
therefore
2=1

Spot the fatal flaw.

divide out (a -b)??

 

[Silly Sausage]

divide out (a -b)??

Thought might be to easy (for you), why though...

 

[Richard Burns]

Didn't want to give the game away but the second line in your post (third line now) gives it away: a=b.

 

[Silly Sausage]

Didn't want to give the game away but the second line in your post (third line now) gives it away: a=b.

Good man.
Must admit, had to think for a while when I found it yesterday.

Have you got any more?

 

[Richard Burns]

Take the digits 1, 2,3,4,5,6,7 and arrange them in a simple sum to total 100.

 

[Richard Burns]

How do you take one from nineteen to give twenty?

 

[Silly Sausage]

How do you take one from nineteen to give twenty?

Slow down boy!

 

[Silly Sausage]

How do you take one from nineteen to give twenty?

I'll have a shufty @ 10011 minus 1 => 10100

 

[Richard Burns]

Bit of a trick really,: use roman numerals XIX take out I =XX!
But i like the thinking for binary!

 

[Silly Sausage]

Bit of a trick really,: use roman numerals XIX take out I =XX!
But i like the thinking for binary!

haha...didn't think of Roman, but we are several centuries more advanced here in Manchester than Cam!

Haven't got an fing clue on your 1st one.

 

[Richard Burns]

Another slightly trick one
15+36+47+2=100

 

[Silly Sausage]

Another slightly trick one
15+36+47+2=100

I'm not going to get to sleep now!

 

[thekingiam]

easy math

 

[Silly Sausage]

Another slightly trick one
15+36+47+2=100

I read the lhs of that summing to 101 the other day! :crazy: I'm losing the plot here.

Here's a quickie for you Richard...