# Wrong, But Useful: Episode 7

It's an awfully short episode of Wrong, But Useful, in which @reflectivemaths and I discuss:

• Colin's upcoming marathon efforts, which you can support by clicking here - bonus points for mathematically interesting sponsorships!
• Dave's son Reuben had his appendix removed, and Dave spent the time grumbling (justifiably) about parking and looking for maths, while Colin incorrectly blames nurses for horror stories that could well be the doctors' fault (oops)
• We awkwardly congratulate @notonlyahatrack on becoming a father, and let him off of his homework
• We talk briefly about @primarydeputy's puzzle:

Arrange the digits 1 to 9 into a nine-digit number such that the first two digits make a number divisible by 2, the first three make a number divisible by 3, and so on.

• Colin enjoyed the worksheets from mathsbot.com
• We make zero progress on the envelope problem
• Colin finally gets to tell the von Neumann anecdote
• Dave sets this month's puzzle:

A regular heptagon has two distinct diagonals, $a$ and $b$. Show that $a+b = ab$.

• We beg for iTunes reviews
• Lastly, MathsJam early-bird discount ends on September 30th, tickets going fast

## Colin

Colin is a Weymouth maths tutor, author of several Maths For Dummies books and A-level maths guides. He started Flying Colours Maths in 2008. He lives with an espresso pot and nothing to prove.

### One comment on “Wrong, But Useful: Episode 7”

• ##### Cav

When I was young we went on holiday to Spain, my brother got ill and Dad bought some infant paracetamol, it was two days before he realised the pipette said 0.5ml not 5ml!

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