A number is missing from the number series below.
Can you find it ?
84, 155, 258, 399 ,?, 819.  Choose the correct choice:  A) 275  B) 350  C) 399  D) 584  E) 449
D   The missing number is 584.   84 = 4^3 + 3^2 + 4   155 = 5^3 + 5^2 + 5   258 = 6^3 + 6^2 + 6   399 = 7^3 + 7^2 + 7   819 = 9^3 + 9^2 + 9   Thus,   584 = 8^3 + 8^2 + 8
<result>D</result>
A number is missing from the number series below.
Can you find it ?
84, 155, 258, 399 ,?, 819.