SSC MTS & Havaldar 2016 · Question 115 of 162
Here, 1 st digit is written at 3 rd position, 2 nd digit is written at 1 st position and 3 rd digit is written at 2 nd position. So, 5 # 3 # 1 will be written as 315. Hence, answer is 315.
Source: SSC MTS 2016 re-exam (held 10-Oct-2017 Shift 1) paper with key+explanations, via prepp.in · reliable-secondary
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