 And if any three quantities, a, b, c, (2,4, 6,) be in arithmetical proportion, the double of the mean is equal to the sum of the extremes, r . THEOREM 2.  Cockers Arithmetick, perused by J. Hawkins - Page 87by Edward Cocker - 1736Full view - About this book
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...l.xtreams г and 6. . ; i ,. TH JE О Ц. EM Ш. ' If Four Numbers are in Arithmetical Pregrejfim, tbi Sum of the two Means is equal to the Sum of the two Er treams. .,' 807,11,15, 19, are Four Numbers in Arithmetical Progreffion, and the Sum of the... | |
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