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Option 3 : 9H
The correct answer is Option 3, i.e 9H.
- 9H has the hardest graphite lead.
- The letter “H” is used to indicate the hardness of a pencil's mark.
- The letter “B” is used to indicate the blackness of a pencil's mark (a darker mark means a softer lead).
- The Higher the number next to the 'H', harder the pencil lead.
- The Higher the number next to the 'B', softer the pencil lead.
- Pencil Lead is a mixture of graphite and clay.
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