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When did John Napier develop logarithm?

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When did John Napier develop logarithm?
« on: July 05, 2015, 11:44:51 AM »
When did John Napier develop logarithm?

Options are:

a. 1416
b. 1614
c. 1641
d. 1804

Correct answer is: b.

b. 1614