Using the given digits only once , the four 2 digit prime numbers are 23 , 41 , 59 , 67 and the the sum of the 4 prime numbers is 190 .
Prime Numbers can be defined as numbers that is greater than 1 and whose only factors are 1 and itself .
For Example : 2 is prime number , 11 is a prime number .
In the question ,
9 digits are given as 1, 2, 3, 4, 5, 6, 7, and 9
we have to form 4 two - digit prime numbers , using each digit only once ,
So , the prime numbers using the given digits using the digits only once is
(i) 23
(ii) 41
(iii) 59
(iv) 67
and the sum of the 4 prime numbers is = 23 + 41 + 59 + 67
= 190
Therefore , the 4 prime numbers are 23 , 41 , 59 , 67 and their sum is 190 .
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