# The Odds of Recurrence of Nonconformities

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#### biboy2012

A nonconformity A happens every 13 years.

Another nonconformity happens every 17 years.

How to calculate when they happen together again?

#### Ninja

##### Looking for Reality
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Re: Recurence of nonconformities

Since both are prime numbers, it would simply be the product of the two numbers: 221 years after the last time they occurred together.

It would be a bit more invloved if they were not both prime.

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#### tyker

Re: Recurence of nonconformities

If they're that predictable, preventive action should be a piece of cake.

#### Claes Gefvenberg

Re: Recurence of nonconformities

17*13=221 (They are both primes).

Addit in edit: Aha, Ninja beat me to it and posted while I was typing.

/Claes

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#### biboy2012

Re: Recurence of nonconformities

Since both are prime numbers, it would simply be the product of the two numbers: 221 years after the last time they occurred together.

It would be a bit more invloved if they were not both prime.
That was very quick!

#### somashekar

Re: Recurence of nonconformities

That was very quick!
Would you like this thread to be moved to "Brain Teasers and Puzzles" subforum biboy ... ?

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#### biboy2012

Re: Recurence of nonconformities

Would you like this thread to be moved to "Brain Teasers and Puzzles" subforum biboy ... ?

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