How many number?

Number Theory Level pending

if x 1 x_{1} ={ 24 n : n 24n : n integer} , x 2 x_{2} ={ 18 n : n 18n: n integer} x 3 x_{3} ={ a + b a+b : a a x 1 \in x_{1} , b b x 2 \in x_{2} } then the number of x 3 x_{3} elements which exist between 1000 1000 and 9999 9999 is

1530 1500 172 1125

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