Posted by **Jane** on Wednesday, February 3, 2010 at 1:57pm.

Andrew arranged the number 1, 2, 3, ...11, 12 into six pairs so that the sum ofany two numbers in a pair is prime and no two of these primes are equal. find the primes and the pairs

- Maths -
**drwls**, Wednesday, February 3, 2010 at 2:53pm
I had to solve this by "trial and error" and finally came up with this. There many be other solutions.

1 + 4 = 5

2 + 5 = 7

3 + 8 = 11

6 + 7 = 13

9 + 10 = 19

11 + 12 = 23

Other prime-number-sum combinations possible would have been 3 and 17, but by forming them I had to use numbers twice or get duplicate sums.

- Maths -
**Rosie**, Monday, August 1, 2016 at 12:36am
(5,8);(3,2);(1,6);(9,10);(4,7);(11,12).

5+8=13

3+2=5

1+6=7

9+10=19

4+7=11

11+12=23

Hope that helps!!!!! :)

- Math -
**Anonymous**, Tuesday, January 17, 2017 at 6:00pm
1+2=3

3+4=7

5+8=11

6+7=13

9+10=19

11+12+23

## Answer This Question

## Related Questions

- math - The Twin Prime Conjecture, which has not been proven, argues that there ...
- math - Two consecutive odd primes, such as 11 and 13, are called a pair of "twin...
- Grade 8 Math - URGENT HELP!Squares into Primes Some primes can be expressed as ...
- Discrete Math - Let n be positive integer greater than 1. We call n prime if the...
- math - every number greater than 2 can be written as the sum of two prime ...
- math - Can someone help me with prime and composite numbers? Prime numbers are ...
- MAths - Find the number of ordered pairs of distinct positive primes p, q (p&#...
- mathematics - A number that is neither prime nor the sum of two distinct primes?
- Math - List the common multiples from 1 to 100 for each pair of numbers. Then ...
- math - 1. Carlos works 8.25 h and receives $102.30 pay. What will he receive at ...

More Related Questions