Question 127

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

Solution

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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