book Maths Puzzle Numerical Ability

What is the smallest positive integer that cannot occur as the difference between two positive prime numbers.

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book Other Question

(1) find the center of the circle whose equation is


x^2+ y^2-3x+8y-8=0




(2) write the equation of the circle with center (-2,1) and which passes through (3,4).
hi, i am having a lot of difficulty with rationals and here is one question i cannot get.

³√-8mı²

thanks!!