DRDO Multi tasking staff Model paper 7

Here, we multiply the 1st number with 2 to obtain the 3rd number and so on and 2nd number with 2 to obtain 4th number and so on:
→ 43 × 2 = 86
→ 172 × 2 = 344
Therefore, 86 × 2 = 172.
Hence, the correct answer is 172.