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Sep 25 2009   12:59PM GMT

Do plural dates take an apostrophe?

Ivy Wigmore Ivy Wigmore Profile: Ivy Wigmore

Which is correct?
The IEEE was formed in the _____ when the Institute of Radio Engineers (IRE) and the American Institute of Electrical Engineers (AIEE) combined.
a. 1960’s
b. 1960s


Answer: b

Explanation:
According to the AP Stylebook, the only case in which an apostrophe is used to create a plural form is that of individual letters.

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