Question

2, 9, 38, 155,?
(a)314
(b) 623
(c) 193
(d) 624​

Answer 1

Answer:

The given sequence 2,9,38,155 follow a pattern :

2×4+1=9

9×4+2=38

38×4+3=155

155×4+4=624.

Hence, 624 replaces the question mark.

Answer 2

Answer:

2 4 1 9

9 4  2  38

38 4  3  155

155 4  4  624

Therefore answer is 624