# Thread: Yikes! That's a big one

1. ## Yikes! That's a big one

This one is for the mathematicians amongst us!!!!

Jezza Bear had just popped in to stay goodnight to Jezzarette 1 and 2 when Jezzarette 2 wanted to ask a question about her homework.

"Professor Barney Owl has set us a fiendishly hard bit of work this weekend Dad, he wants me to find the last number in the sum below and we are not allowed to use a calculator..... Where should I start....Jezza Bear scratched his head, " Gosh J2 123456789 to the power of 123456789, that's a big number." Can you help him?

<table border=0><td> 123456789</td><td> 123456789</td></table>

2. ## Re: Yikes! That's a big one

<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">9</span hide>

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<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">All odd powers of a number ending in 9 end in 9, and all even powers end in 1</span hide>

3. ## Re: Yikes! That's a big one

<img src=/S/grin.gif border=0 alt=grin width=15 height=15>...have a [choccy bar] I won't ask for the proof <img src=/S/evilgrin.gif border=0 alt=evilgrin width=15 height=15>

4. ## Re: Yikes! That's a big one

Proof? It's self-evident! <img src=/S/blackteeth.gif border=0 alt=blackteeth width=20 height=20>

5. ## Re: Yikes! That's a big one

<table border=1><td> <div style="width: 100%; background-color: #FFFFFF;"> <big><big>1) THE PROOF IS SELF EVIDENT</big></big> </div hiblock></td><td><div style="width: 100%; background-color: #FFFFFF;"> <big><big>2) BOTH SENTENCES ON THIS SIGN ARE FALSE</big></big> </div hiblock></td></table>

<img src=/S/innocent.gif border=0 alt=innocent width=20 height=20>

6. ## Re: Yikes! That's a big one

Formally speaking, you could give a proof by induction.

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