Question 127

If x, y(x < y) are primes satisfying x + y = 30, then the number of such pairs (x, y) is

Solution
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we have given 

 x + y = 30,    and     x, y(x < y)

then we have 

y - x  > 0   

y  > x 

then y should be positive integer and the  x have the following condition 

x > 0

x = 0 

x < 0  

so we have three pair of satisfying the condition of (x,y) in equation x + y = 30     answer 

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