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Explore the Back-StoryTry this beautiful Problem based on Number theory from AMC 10A, 2002 Problem 15.

Using the digits $1,2,3,4,5,6,7$, and 9 , form 4 two-digit prime numbers, using each digit only once. What is the sum of the 4 prime numbers?

- 150
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- 180
- 190

Arithmetic

Divisibility

Prime Number

Elementary Number Theory by David M. Burton.

AMC 10A 2002 Problem 15

190

First try to find the probable digits for the unit place of the prime number.

The two digit prime number should end with $1, 3, 7, 9$ since it is prime and should not divisible by $2$ or $5$.

So now try to find which two digit primes will work here.

So, the primes should be $23, 41, 59, 67$.

Now find the sum of them.

Try this beautiful Problem based on Number theory from AMC 10A, 2002 Problem 15.

Using the digits $1,2,3,4,5,6,7$, and 9 , form 4 two-digit prime numbers, using each digit only once. What is the sum of the 4 prime numbers?

- 150
- 160
- 170
- 180
- 190

Arithmetic

Divisibility

Prime Number

Elementary Number Theory by David M. Burton.

AMC 10A 2002 Problem 15

190

First try to find the probable digits for the unit place of the prime number.

The two digit prime number should end with $1, 3, 7, 9$ since it is prime and should not divisible by $2$ or $5$.

So now try to find which two digit primes will work here.

So, the primes should be $23, 41, 59, 67$.

Now find the sum of them.

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