There are three types of ERO
1. Interchange two rows.
2.Multiply a row with a nonzero number.
3. Add a row to another one multiplied by a number.
If these
operations are performed to rows then it is called ERO.
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Materials for Ballast
1. Broken Stones 2.Gravels 3.Cinders / Ashes 4.Sand 5.Kankar 6.Moorum 7. Brick Ballast
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