If x, y(x < y) are primes satisfying x + y = 30, then the number of such pairs (x, y) is
we have givenÂ
 x + y = 30,   and    x, y(x < y)
then we haveÂ
y - x > 0 Â
y > xÂ
then y should be positive integer and the x have the following conditionÂ
x > 0
x = 0Â
x < 0Â Â
so we have three pair of satisfying the condition of (x,y) in equation x + y = 30Â Â Â answerÂ
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