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Dear Sir/Madam (Sir or Madam)
Do not over-use the slash to indicate "or". It can suggest
laziness on the part of the writer. The "and/or" construction is widely
considered to be very bad form.
2. Use a slash for fractions:
1/2 (one half)
2/3 (two thirds)
9/10 (nine tenths)
3. Use a slash to indicate "per" in measurements of speed,
prices etc:
The speed limit is 100 km/h. (kilometres per hour)
4. People often use a slash in certain abbreviations:
This is my a/c number. (account)
John Brown, c/o Jane Green (care of)
5. A slash is often used in dates to separate day, month and
year:
On credit card: Expires end 10/15 (October 2015)
6. The slash is used to separate parts of a website address (url)
on the Internet, and to separate folders on some computer systems:
www.example.com/writing/slash.htm
file:///Users/mac/tara/photos/image.jpg
The colon is used to introduce a strong pause within a
sentence. The job of the colon is simple: to introduce.
1. Use a colon to introduce a list:
There are three countries in North America: Mexico, the USA
and Canada.
2. Actually, you can use a colon to introduce a single item,
especially when you want to emphasize that item:
We were all waiting for the hero of the evening: John.
3. Use a colon to introduce direct speech or a quotation:
He stood up and said loudly: "Ladies and Gentlemen, please be
seated."
4. Use a colon to introduce an explanation:

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