The sum of 3rd and 18th terms of an A.P. is, 7 and sum of its 7th and 14th term is, -3. Find its 10th term.
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Title: Her Majesty's Magnetical and Meteorological Observatory, Toronto (continued)
Authors: Thiessen, A. D.
Journal: Journal of the Royal Astronomical Society of Canada, Vol. 36, p.457
Bibliographic Code: 1942JRASC..36..457T
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