Who can find an answer different than 7.

**Greg Ward** · 14th January 2008, 11:21 AM

You need to work on the alphabet word challenge under 'vowel' in the Quiz section to get your freebies.

Maths is obviously too easy for you, we need to get you off the straight and narrow.

7x62 times is really only small number (in relation to many primes and is obviously not a prime in any event.....just give me a little time to divide by 199.... I know the last four digits, but the rest by long hand division will take an hour or so.

Greg

**Wongo** · 14th January 2008, 11:22 AM

OK I've got it.

it is 99 sevens.

I am dead serious.

**Wongo** · 14th January 2008, 11:26 AM

The next one is 198 sevens

Then 297 sevens

Then 396 sevens

Then 495 sevens

God is great.

**Greg Ward** · 14th January 2008, 11:27 AM

Nobody can check you in any event....

You are right, this does deserve some free maple, do you want the Canadian or US syrup?

Greg

**Wongo** · 14th January 2008, 11:29 AM

It will try to explan when I have time. Anyone interested?

**Wongo** · 14th January 2008, 11:37 AM

Originally Posted by Greg Ward

Nobody can check you in any event....

You are right, this does deserve some free maple, do you want the Canadian or US syrup?

Greg

Can I have a bit of blackwood instead?

**Greg Ward** · 14th January 2008, 11:42 AM

You just got out your book of 'prime numbers' and multiplied them individually x 199 until you got a number that consisted of a series of sevens.

Greg

**ss_11000** · 14th January 2008, 11:53 AM

explain away wongo.

**Wongo** · 14th January 2008, 03:36 PM

Let the number be 77777….77777
Now rewrite the number to
7 +
70 +
700 +
7 * 10^3 +
7 * 10^4 +
.
.
.
7 * 10^n

knowing
7 / 199 , remainder = 7
70 / 199, remainder = 70
700 / 199, remainder = 103
7000 / 199, remainder = 103 * 10 = 1030 and 1030 / 199, remainder = 35
7 * 10^4 / 199, remainder = 35 * 10 = 350 and 350 / 199, remainder = 151
.
.
.
and so on.

If 77777….77777 is divisible by 199 then the sum of the remainders must be divisible by 199 too.

hence remainder of (7 + 70 + 103 + 35 + 151 + ...) / 199 is 0

In Excel, the table shows remainder of each digit and the sums. The first sum that has 0 as remainder is the answer. See row 100.

**Greg Ward** · 14th January 2008, 03:46 PM

I'm impressed!!!!!!!

Definately worth some blackwood.

Wait until I buy the paint.

Greg

**ss_11000** · 14th January 2008, 06:23 PM

all i can say is: your a genius.

btw - whats a reminder? ( mathematically speaking)

**Wongo** · 14th January 2008, 11:41 PM

Sorry dude, I have been missing the "a" all day. I was too excited. It should be remainder.

**ss_11000** · 15th January 2008, 12:28 AM

Originally Posted by Wongo

Sorry dude, I have been missing the "a" all day. I was too excited. It should be remainder.

no worries - so its not some super secret conspiracy of the great mathematicians

**tea lady** · 15th January 2008, 10:31 AM

You guys! I go away for the day and look what happens behind my back!!
You're all playing with sevens without me!

Although I don't think I could have played with them as good as Wongo.

**Wongo** · 15th January 2008, 11:50 AM

Tea lady, mathematics is a form of art.

Thread: Who can find an answer different than 7.

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You say Myrtle, I say Maple, It was an exotic US pink cherry

Congratulations

Simple

Worth a stump or two. (It stumped me!)

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