SSC JE Mechanical Engineering 22 Mar 2021 Shift 2 Papers

The logic followed here is;
[(First Number + Second Number) × 2] - 1 = Third Number
In (8, 3, 21):
[(8 + 3) × 2] - 1
= [11 × 2] - 1
= 22 - 1
= 21
Similarly;
In (5, 7, 23):
[(5 + 7) × 2] - 1
= [12 × 2] - 1
= 24 - 1
= 23
Hence, "23" is the correct answer.