Two series I don't get...!!!

Level pending

1 ) 1) The first series is 7 , 12 , 35 , 174 , x 7,12,35,174,x ,what is the value of x x ?

2 ) 2) The second series(a bit simple) is 484 , 612 , 624 , 672 , y 484,612,624,672,y ,what is the value of y y ?

What is the value of x y x-y ?


The answer is 413.

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