SSC JE Mechanical Engineering 27 Oct 2020 Shift 1 Papers

The pattern follows here is:There is Two Sequence of number as follows:
i) 31, 23, 17, 11, 5
These are alternate prime numbers in decreasing order.
ii) 12, 12, 18, 36, 54, 162
12 = 12 × 1
12 = 12
18 = 12 × 1.5
18 = 18
36 = 18 × 2
36 = 36
54 = 36 × 1.5
54 = 54
162 = 54 × 3
162 = 162
Hence, the correct answer is "162".