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Q) How much experience etc. of Instructors required for appointed as Instructors

has 1-year practical experience of below ground work in mines
has 2 years practical experience of below ground work in mines
has 3 years practical experience of below ground work in mines
has 4 years practical experience of below ground work in mines
has 5 years practical experience of below ground work in mines

Solution:

has 3 years practical experience of below ground work in mines

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