# Thread: 1\$ = 1c... what's wrong?

1. Hi all,
By now y'all have seen a few 'proofs' lately, each containing a different mathematical error.

Well, here is another. This one is by far not the most difficult, but it might be a bit fun to ponder.

Theorem: 1\$ = 1c (here c = cents)
'Proof':
1\$ = 100c
= (10c)*(10c)
= (0.1\$)*(0.1\$)
= 0.01\$
= 1c
What's the error here...?

Have fun.
Cheers,
william

2.

3. Originally Posted by william
Hi all,
By now y'all have seen a few 'proofs' lately, each containing a different mathematical error.

Well, here is another. This one is by far not the most difficult, but it might be a bit fun to ponder.

Theorem: 1\$ = 1c (here c = cents)
'Proof':
1\$ = 100c
= (10c)*(10c)
= (0.1\$)*(0.1\$)
= 0.01\$
= 1c
What's the error here...?

Have fun.
Cheers,
william

Sorry Will 100c = 10 * 10c NOT 10c * 10C, that would be 100c^2
10(0.1\$) = 1\$

4. That didn't take long!

5. Arrgh, billco, next time keep it for yourself, I figured that one out
(within 2 minutes of thinking)

6. Figured out in two seconds. Know that it is in second step. These problems are mathematically correct, but their physics are wrong.

7. agree to sramanujam
the trick can be guessed when there is unit present in the first line

8. Sorry guys I intended to do it as a PM but somehow hit the wrong button!

Just be thankful I'm not in charge of nuclear missile silos!

9. Telephone rings:
general: "Billco, dont press the big red button"
billco: "okey"
billco hangs up
billco: "What were i supposed to do again? Oh yeah press the big red button"

10. Constantly following me around and posting personal insults - which are nothing to do with the thread, do nothing to convince people that you are anything other than childish, Again please keep you insults to personal messages which i can delete without reading or responding to.

Or you could try and solve the posed problem if you have the ability.

11. Originally Posted by william
Hi all,
By now y'all have seen a few 'proofs' lately, each containing a different mathematical error.

Well, here is another. This one is by far not the most difficult, but it might be a bit fun to ponder.

Theorem: 1\$ = 1c (here c = cents)
'Proof':
1\$ = 100c
= (10c)*(10c)
= (0.1\$)*(0.1\$)
= 0.01\$

= 1c
What's the error here...?

Have fun.
Cheers,
william
10 cents times 10 cents is NOT 1 CENT!!! :wink:

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