Select the number that can replace the question mark (?) in the following series.

6, 13, 41, 167, ?

Given: 6, 13, 41, 167, ?

Logic: Number are multiplied by 2, 3, 4 and 5 and +1, +2, +3 and +4.

6 × 2 = 12+ 1 = 13

13 × 3 = 39 + 2 = 41

41 × 4 = 164 + 3 = 167

Similarly,

167 × 5 = 835 + 4 = 839

Thus, correct option is (a).