Question

Can you find a pattern and find the missing number in the series given below - 84, 155, 258, ? , 584, 819.

Answer 1

084 = 4*3 + 4*2 + 4*1
155 = 5*3 + 5*2 + 5*1
258 = 6*3 + 6*2 + 6*1
399 = 7*3 + 7*2 + 7*1
584 = 8*3 + 8*2 + 8*1
819 = 9*3 + 9*2 + 9*1

So, 399 is the answer.