JEE Math Practice Question
Let $A P(a ; d)$ denote the set of all the terms of an infinite arithmetic progression with first term $a$ and common difference $d>0$. If \[ A P(1 ; 3) \cap A P(2 ; 5) \cap A P(3 ; 7)=A P(a ; d) \] then what does $a+d$ equal?
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