A number is missing from the number series below.
Can you find it ?
?, 155, 258, 399 , 584, 819. Choose the correct choice from the following answers.
A) 275 B) 84 C) 399 D) 421 E) 449
B   The missing number is 84.   155 = 5^3 + 5^2 + 5   258 = 6^3 + 6^2 + 6   399 = 7^3 + 7^2 + 7   584 = 8^3 + 8^2 + 8   819 = 9^3 + 9^2 + 9   Thus,   84 = 4^3 + 3^2 + 4
<result>B</result>
A number is missing from the number series below.
Can you find it ?
?, 155, 258, 399 , 584, 819.