Math Is Fun Forum

Greaterpathmagician

Member

Registered: 2009-06-16

Posts: 32

Sets and Venn Diagrams

Hello

I can't get my head around this simple question.

Of the natural numbers less than 25, how many are divisble by 2 or 3 or both.

I got 12 for dvisible of 2 and 4 for divisble of 3 and 4 for divisible of both.
However as I put it in a venn diagram I got the answer wrong.

Please help

Thank you for any help, it is greatly appreciated:D

Greaterpathmagician

Member

Registered: 2009-06-16

Posts: 32

Re: Sets and Venn Diagrams

Don't worry I solved the question.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Sets and Venn Diagrams

HI;

For the Venn diagram:

You have 12 + 8 - 4 = 16

The ones that aren't are the primes less than 25, and 1.

{1,3,5,7,11,13,17,23}

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.